Krissures are objects found in the Shipwrecked DLC. After a player has dug up a Magma Pile, a Krissure may appear and erupt. Krissures will alternate between dormant and erupting states. It can be used as a light source, but it may burn if a player stands too close. Note that it's the initial burst of krissure that sets things on fire, not the lasting flame itself. The player can cook Food over an erupting Krissure. Flooded krissures do not erupt.
If the player dies near Krissures and uses a Touchstone, Life Giving Amulet, Meat Effigy or another method of resurrection, the Krissure will sometimes get stuck in the erupting state, but no longer allow the player to cook Food.
Willow, while not getting any fire damage, does not get a Sanity bonus while standing next to an erupting Krissure.