After finishing successfully an ironman run of FE10, I started to do a new challenge: beating FE7 on HHM with as few losses as possible
After beating chapter 18 I've fulfilled this challenge yet, NO one died yet.
As for the used units aside of the lords I'll prioritize on Raven, Oswin, Florina (? depending on her strength growth), Canas, Priscilla (because of Raven support) for now.
Since I played this mode once yet, and this about seven years ago, my memories about this game are vague.
The noticable change I remember is Cog of Destiny in which physical units in normal mode are replaced by mages which makes it become probably very tricky and long.
Other than that I remember the Zephiel chapter can be a random lose, if Jaffar dies and can't work as decoy bird anymore.
As for prepromoted units I definitely want to get Harken and Geitz because I remember they did A LOT in my only done HHM run.
If you have any recommendations, just share.