They seriously gave Cordelia a worse version of Amiti.
Cordelia's Lance: "10 Mt. Inflicts Spd-2. If unit initiates combat, unit attacks twice. [Unique] At start of combat, if unit's HP >= 70%, grants Atk/Spd+4 during combat."
Elincia's Amiti: "11 Mt. Inflicts Spd-2. If unit initiates combat, unit attacks twice. [Unique] If unit initiates combat, grants Atk/Spd+4."
Considering Cordelia's one point higher base attack, they end up doing the same damage as both, with neutral attack, will have 49 Atk. The difference is that Elincia simply needs to initiate and not be dead whereas Cordelia needs to have >= 70% HP, but will have Atk/Spd+4 on both phases. Also, Cordelia will have one less speed than Elincia since Cordelia has 35 base neutral speed to Elincia's 36. Brave weapons are usually player phase unless they have the ability to Brave on enemy phase as well like that of the Meister weapons or Altina's Ragnell-Alondite or Keaton's Wolfskin Fang. So, Elincia's Amiti being pure player phase is just fine for a personal Brave Sword that doesn't have the ability to Brave on enemy phase. Similarly, being at >= 70% HP is fine for slow or very frail Brave units who do not want to take damage, but for Brazen, for Brash Assault, Desperation builds, for and fast Brave units who want to be in Desperation range, they want to be at a certain HP threshold that would likely be <= 70% HP which is outside of Cordelia's Lance's unique refinement threshold. Additionally, Cordelia's relatively fast, so she can run a fast Brave build. That said, against units who can inflict a lot of splash damage, in Aether Raids with Bolt Towers and Bolt Traps, or against someone like Hector & Lilina where in the player's hands they can use their Duo Skill to inflict 20 damage if she's in their range, or against multiple Dumas with Upheaval, Cordelia could easily be knocked out of her unique refinement's HP threshold. Elincia on the other hand simply doesn't care when it's her turn. Sure, Cordelia could maybe have good attack to maybe Counter, Vantage, but the health condition doesn't really mesh well with Vantage much less Brazen or Desperation.
The only reason I can think of other than their differences in rarity, so Cordelia being easier to merge and likely a +10 unit for many people already, for Cordelia's Lance having one less Mt than Amiti is that Cordelia's neutral attack is higher than Elincia's by one. If that were the case, then Luke should have had a 12 Mt personal Brave Sword to offset him having one less base neutral attack than Meisterhardt. But that still is stupid because Cordelia, a lance flier, does not compete with Elincia, a sword flier. Even with the consideration of rarity, Klein and Gordin ended up with personal Brave Bows and didn't get gimped with their bow's Mt because other 5* Brave Bow or Brave ranged units exist.
A lance version of Amiti was the generic thing they could have done for Cordelia, but they decided to do worse. Maybe it would be too crazy, but Golden Naginata's unique refinement effect: "At the start of combat, if unit's HP ≥ 70%, deals +7 damage", would have at least been something different than an effect that is not as practical as Swift Sparrow 2. The crazy idea that popped into my head for Cordelia was her ending up with Steady Impact as a unique refinement for her non-Brave personal lance. Not sure why, but hey, preventing follow-up attacks and patching up her low defense could be interesting. The base effect could be anything really. Maybe something like:
"16 Mt. Unit can move to a space adjacent to a flying ally within 2 spaces. [Unique] If unit initiates combat, grants Spd+7 and Def+10 during combat and foe cannot make a follow-up attack."
If you want the base effect to be "underwhelming".
In the end, Cordelia's Lance is a personal Brave Lance and that's good. Still, the one less Mt feels insulting and it's not going to be surprising if a new lance flier or blue melee flier for that matter is introduced with a Brave weapon that has 11 Mt and the same or higher attack/overall offenses than Cordelia.
Leif's Light Brand is the first weapon to gain a Killer effect for its unique refinement? I know that Roy's Binding Blade was the first weapon to gain effective damage when refined and CYL Lucina's Geirskogul was the first lance to gain effective damage when refined. I think the best part about with its unique refinement is that Light Brand becomes a personal Killing Edge. Killer effect is powerful and that's all there is to it. Overall, unique refined Light Brand ends up having a bunch of effects and that's kind of it with the Killer effect being the stand out thing.
Light Brand: "16 Mt. Grants Def+3. If foe's Def ≥ foe's Res+5, deals +7 damage. [Unique] Accelerates Special trigger (cooldown count-1). At start of combat, if foe's HP = 100%, grants Spd/Def+4 to unit during combat."
As noted before, Leif continues to have the Spd/Def thing he shares with Quan and Ethlyn. It's just the condition effect is in a weird spot. Regal Blade debuted the effect and granted Lloyd Atk/Spd+2, then mage knight Erika and L'Arachel ended up with a slightly stronger version granting them Atk/Spd+3, Lloyd caught up to that with in a weapon update putting Regal Blade on par with Gleipnir and Ivaldi. Well, then Tibarn's Hawk King Claw added in requiring he initiates to give him a guaranteed follow-up and summer Lyn had the same condition as Tibarn's Hawk King Claw, but hers granted Atk/Spd/Def/Res+4. Dimitri's Noble Lance had a similar effect that checked if both he and his foe are at full health or not and granted him a guaranteed follow-up. Now we're up to Perceval who returns to only having the check be his foe's HP = 100%, but his Prized Lance grants him Atk/Spd/Def/Res+4. So, Prized Lance only has a Killer effect as its other effect while unique refined Light Brand has four effects, but the overall effect and how its continues to get stronger is just weird to me. I guess a weird comparison would be if the Wo Dao effect increased by one damage ever now and again or granted a different effect like it healed the user for 5 HP when they activate a special.
Back to Leif, with neutral Leif with his default kit and if he meets all the conditions will have 48 Spd and 41 Def in combat when he initiates. Leif has 38 base neutral speed and gains +4 from the unique refinement and +4 from Steady Blow and Leif has 30 base neutral defense and has +3 from Light Brand, gains +4 from the unique refinement, and +4 from Steady Blow. With the Steady Posture 2 seal, he would have 48 Spd and 41 Def on both phases. With the Killer effect from the unique refinement and with S Drink, Leif can have a 1 cooldown Bonfire or 2 cooldown Ignis. With Time's Pulse, then he'd have a charged Bonfire and a 1 cooldown Ignis. Leif's HP isn't that high, so Infantry Pulse can give him charged Bonfire or Ignis. With 41 Def in combat, he will get 20 damage from Bonfire and 32 from Ignis. So, I guess he can be melee infantry nuke for what that's worth.
Steady Impact when it is introduced would be something Leif would definitely like as it would be an additional Spd+3 and Def+6 for 51 Spd and 47 Def in combat when he initiates and when his foe's HP is full and prevent his foe's follow-up attack. Alternatively, Swift Impact could help to give him the same speed boost, but add Res+10 which could be helpful against dragons and Close Counter mages.
So, to sum it up, Light Brand might not be that great, but it works.
Henry's Corvus Tome being a personal -raven tome with a low attack check to give him more bulk and damage through inflicting Atk/Res-6 and Guard is nice.
Corvus Tome: "14 Mt. Grants weapon-triangle advantage against colorless foes,and inflicts weapon-triangle disadvantage on colorless foes during combat. [Unique] At start of combat, if foe's Atk >= unit's Atk+3, inflicts Atk/Res-6 on foe during combat and Special cooldown charge -1 on foe per attack. (Only highest value applied. Does not stack.)"
It's another one of the this would work well with a Lull if we had more of them and easier access to them. Lull Atk/Res doesn't exist yet, but paired with Corvus's Tome's unique refinement and if he passes the attack check, Henry would be able to inflict Atk/Res-9, negate his foe's Atk/Res buffs, and inflict Guard on them. That would give Henry an effective 46 Atk, 41 Def, and 34 Res in combat. The attack part's not that great, but the bulk is nice. I guess for a comparison, Sophia with Eternal Tome has 47 Atk and the Bracing Stance 2 unique refinement gives her 32 Def and 33 Res on enemy phase. So, she doesn't need to pass an attack check and Lull Atk/Res 3 to have 47 Atk, but she doesn't have Guard on either phase and her bulk is mainly enemy phase for what that's worth. Fortress Def/Res would cost him two points of attack, but bump him up to 47 Def and 40 Res. Bracing/Sturdy/Mirror Stance 3 probably would be better, but Bracing Stance 3 and Sturdy Stance 3 have not been introduced yet. Probably Close Counter too. Fortress Def and T-Adept would be budget options.
Henry's in a better spot, but I'm curious to where he stands in comparison to Raigh and Sophia where Sophia was briefly noted above. Raigh has effective damage against cavalry and Dull Ranged 3 as the base effects of his tome and an -owl effect for the unique refinement allowing him to gain stats all around, but probably not as much bulk as Henry. With Null C-Disrupt, Raigh can deal with disruptive ranged units, particularly cavalry like CYL Veronica. But he does not have WTA against colorless units like Henry and Sophia and like Sophia, he doesn't have Guard or debuff his foe; Raigh only negates buffs from ranged units.
Rebecca's Bow being a personal Killer Bow is sure. Killer effect is good. The unique refinement being a one point stronger version of Arthur's Axe's base effect is sure, I guess.
Rebecca's Bow: "14 Mt. Accelerates Special trigger (cooldown count-1). Effective against flying foes. [Unique] If bonus is granted by a skill like Rally or Hone is active on unit, grants Atk/Spd/Def/Res+4 during combat."
I wished that they played with Rebecca's background as hunter, so at least something like effective damage against beasts or a bow centered around dealing with beasts. My ideas where this: https://forums.serenesforest.net/index.php?/topic/81253-general-weapon-refinery-discussionspeculationcreation-thread/&do=findComment&comment=5477368.
So, it's not as loaded as Niles's Bow, but one thing to consider is that in return for seven resistance, Rebecca has five more attack giving her an average-ish 29 base neutral attack to Niles's low 25 base neutral attack. +Atk Niles matches Rebecca neutral base attack stat, but Rebecca can choose between +Atk or +Spd for higher overall offenses. That is to say, she is not as reliant on specials or her foe's Def to be greater than their Res+5 to deal damage like Niles. Although she needs a field buff and it's in combat, she can match Niles's neutral resistance while exceeding him in overall offenses and defense. One Fortify Res 3 gives Rebecca Res+4 bumping up her 27 neutral resistance to 31 and with the unique refinement, she'd have 35 Res in combat along with 47 Atk, 38 Spd, and 25 Def. It's something different she does compared to Niles targeting foes with lopsided defenses and being able to churn out Iceberg or Glacies with Time's Pulse.
Niles's Bow: "14 Mt. Accelerates Special trigger (cooldown count-1). Effective against flying foes. If foe's Def >= foe's Res+5, deals +7 damage. If unit's Spd > foe's Spd, grants Special cooldown charge +1 per unit's attack. (Only highest value applied. Does not stack.)"
I guess it's like Odin's Grimoire having a personal -blade tome with a good support through its Atk/Spd Link 3 unique refinement and Mae's Book of Orchids having a Death Blow 3 tome and sharing the same unique refinement as Odin's Grimoire. That is to say, Mae has an actual, high attack stat and good resistance in return for low defense and HP while Odin's attack is low, but he has good mixed bulk. Book of Orchids does for some people run into the issue of not being as good as Lilina's Forblaze and Mae's speed being "wasted" if like Lilina, her tome is all about attack stacking. Similarly, why Nino and Tharja ended up with personal -blade tomes that have a unique refinement when they have actual attack stats in comparison to Odin.
I guess the one issue with Rebecca now is the existence of Tanya and Norne who are at least both in the 4* summoning pool. Granted, neither of them have personal bows unlike Rebecca who recently gained one and can't really get the same amount of in combat stats as Rebecca can now. Tanya is essentially a gen 3 version of Rebecca where she has +4 HP, +1 Atk, +3 Spd, +4 Def, and +1 Res over Rebecca. Norne's raw amount of stats as a gen 4 physical ranged infantry does make her like a gen 4 version of Rebecca, but Norne leans more towards physical defense while incidentally sharing the same base neutral resistance as Rebecca. Norne has +5 HP, +3 Atk, +2 Spd, and +10 Def over Rebecca. Norne comes with Guard Bow, so by default she's more of an enemy phase unit which works well with her mixed bulk. I'm not sure where I'm trying to go with this, so I'm just going to end it.
Rebecca's Bow works. I guess that's the entire gist of the weapon update for me: they work.