tl;dr: Most OE squads with dual Zeruiah/Zelnite leads will probably be able to auto the dungeon (if you get lucky and spawn Galtier - Ciara may need a pure offense squad to OTKO reliably). Free gem for first clear.

Keep in mind if you're struggling with two drop rate leaders that you only really need one to max item drops!

Just did my first run of this dungeon, figured nobody else has posted about it. It's easy enough. I cleared it for the first time with dual Zeruiah leads (to max item drops), so damage wasn't an issue (incoming or outgoing). The boss does take a long time to die, however.

Boss: Galtier

• Galtier will attack before the player's first turn. He gives himself a barrier (and recasts it frequently during the fight)
• Galtier's damage output is really low. My squad was never in danger with some units as low as 11k HP and no HP/DEF on LS.
  • My defensive buffs were mitigation, ATK down and ATK->DEF conversion (my squad had no DEF buffer or ATK buffer because reasons mostly involving SP challenges asking me to get 10000 BC in a single dungeon recently and I was too lazy to switch units to something more sensible, but it didn't matter)
• Some single target BB drain. Not enough BC resistance to be an issue with Zeruiah/Zelnite leads.
• Don't know if he does any ailments because I had null. He never buff wiped me.
• Not immune to crits, but Miku didn't seem to give my squad much damage, so probably crit damage resistant anyway.

Alternate boss: Ciara

• Ciara gets first turn attacks like Galtier, but they're survivable by units over about 14-15k HP
• Ciara is a threshold-based fight. For roughly every 10% damage you deal she'll use an extra AoE on her turn.
• Most of these AoE are individually weak after being mitigated by player buffs, but at one threshold she will use a buff wipe, and anything that happens after that will hurt.
• If she's hurting you too much, keep in mind that you only need one item drop lead to max drops, and she can't buff wipe most LS effects.

Stage gave 6324 EP (after 70% guild bonus), 11 Eerie Bones, 7 Cursed Bones. The bone drops are probably slightly random.

First time clear reward of 1 gem.