Allows you to learn the extra healing spell.

Extra healing is a directional spell that heals 8d8 HP and cures blindness. This will wake up a sleeping monster, but not anger it.

Unlike the potion of extra healing, this spell cannot increase maximum hitpoints, and does not cure hallucination or sickness. It does, however, cure blindness, making it useful in conjunction with a Magic trap.

This is an emergency spell.