SHELL

1 APcost
1cooldown (turns)
yourselftarget
3ranks

Unlocks at 6 DEF and grows with DEFENSE.

Ranks

RankEffect
1CLEANSE, +8 BLOCK
2CLEANSE, +11 BLOCK
3CLEANSE, +14 BLOCK

Shown for a raccoon that has just met the unlock; higher DEFENSE makes it stronger.