Tips for the FEH: Lost Heroes event for the people who didn't play it back then:

- Good units: Any that is able to deal damage to a large area without any dependency on others. Examples: Alfonse, Euden, Marth, H!Elly, W!Elly, annelie, the Mohun units (FS is good), most axe units

- Top two elements to bring to this fight are light and shadow. Others are fine, but you'll have to be mindful of opposing element enemies, as this quest throws all elements at you. Light and Shadow do not get hit for weakness like other elements, so they're good for that.

- As enemies come in groups, you'll want a weapon type that's able to attack multiple targets with the normal attacks easily

- Preferably, don't bring a healer, as everyone needs to be able to stop enemies

- One possible exception to the above 2 points: Heinwald after spiral

- Ideally, your party should have some form of incidental healing like from H!Elly and Cupid

- If you're bringing a light unit and have a cupid, PLEASE bring him, even at 0 unbinds, as you get an easy heal and not lose any damage. Other offensive dragons with heals are cool too.

- DON'T rush to the boss room after the defense is done. If defense is completed quickly (forgot the exact requirements), the Shadow Knight spawns, and gives a ton of Valor. Valor is the same as the stuff you farm lots of in facility events

related vid:

- Permanent buffs like from Slayer's/Striker's Strength or Dragon Claws are really good here. Just be mindful that all buffs cap out at 10 stacks per buff icon, regardless of the intensity of the buff.

Glad you all liked this thread. Some extra notes:

- They're tweaking it to be more solo friendly. Might apply to coop as well.

- They also gave us incredible amounts of powercreep since then (weapons, mana spirals, new units, etc.) so I might be overestimating the requirements.