Tooth and Nail

Tooth and Nail is a passive item added in The Binding of Isaac: Repentance.

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. The first three flashes are accompanied by a "ticking" sound, the final one with the spike extension sound of a mimic chest.
 * Unlike, Isaac can still move and shoot tears.

Synergies

 * Contact damage items work great with Tooth and Nail, such as // for extra damage, for Black Heart generation,  for coin generation etc.


 * As Isaac is invincible 1/6th of the time, with some luck, Tooth and Nail may save him from the falling sword.
 * Allows usage without taking damage during invincibility.
 * can use this item to prevent additional damage from occuring after losing the (for example, exiting a curse room after being hit), and it does not use up the Holy Mantle's 1-hit protection if it has not been lost.

Seeds
3T0E WTWQ (Treasure Room adjacent to spawn)