Door in the Darkroot Garden

Defender, indestructible.
At the end of combat on your turn, you may
meld this with Crest of Artorias, into
Alvina of the Darkroot Wood.
"The door leads to the grave of Sir Artorias the Abysswalker. Many adventurers have left for the
grave, but none have returned, for they make easy
prey for local bandits."