Isaac periodically turns into a spiked statue, briefly becoming invulnerable and dealing contact damage.
Quote
"You feel prickly"
Effects
Every 6 seconds, Isaac turns to stone and sprouts spikes for 1 second. While Isaac is in this state, he is immune to damage and deals 40 contact damage.
Isaac flashes white four times before turning to stone on the fourth flash. First three flashes are accompanied by a "ticking" sound, the final one with the spike extension sound of a mimic chest.
Unlike
Gnawed Leaf, Isaac can still move and shoot tears.