[Coda]

She becomes Healer / God on her ultimate evolution, picks up a Light sub-element, and her leader skill expands to be 3xATK to Healer and God types.

Fairlio there becomes Dragon / Healer and is a fantastic sub on a healer team.

Echidna and Siren are fairly easy to land. They've got a really low (2%?) drop rate from the normal dungeons they're bosses in, but they occasionally have coin or special dungeons with a 15 stamina cost that give them a much higher drop rate. Siren works a little better than Fairlio on a team with blue Valkyrie just by virtue of also being blue but Fairlio has better HP; meanwhile, you've seen us praising Echidna recently. :P

Edit: That said, Valkyrie Reine's uvo requires an Extreme King Metal Dragon, which is a 99-stamina dungeon that's EXTREMELY hard unless you have the right team (I really hope that the Droidragon dungeon runs again soon...) so don't hold your breath for it -- you won't be able to even see the dungeon for a long time.