What is the utility of the party moral and how do i improve it
Party moral isn't used at the moment.
The moth girl is special and will appear later again, but not as a capturable monstergirl.
Holy Benedict is a blade Trey gets during one of his special events.
Bunny ear can be found in chests.
Setsuna+ is the improved version of Tsubaki's katana Setsuna, and requires a legendary whetstone and the dusty crafting book to improve it at the anvil of the fire raid area.
Thanks
If you mean the new boss fight, a way to prolong the fight is to use the "swap" ability, since the instant defeat only happens when all four active battlers are cursed. If you swap out a cursed party member, it gives you one more turn. So you can keep the battle go on for much longer this way.
The frozen gauntlet is a weapon Brad can get during the trips of the female adventurer trio.