Raven

Raven increases undead attack speed in Outland Battle. It also enhances Undead Tribe Friendliness from Unit Seals, making it easier to reach 1000 Undead Friendliness from airships and unlock an additional artifact slot.

Hero Couple (Crow Knight)
Unknown for now.

Acquisition
Spirit Highlands

Pet Shop

Available (still to be confirmed)

Secret Shop

Not available.

Skill 3 - Awakens the hidden special ability of Senior Crow Knight
unknown for now.