When enemies are defeated they sometimes leave behind a chest. Chests contain one of 5 items:
Health Potion Edit
Common. Restores half your health (rounded down). Can carry up to 3.
Uncommon. Automatically gives you a sword and shield. Can carry up to 3.
Very rare. Used for building the shrine.
Dragon Summoning Spell Edit
The Dragon Summoning Spell summons a dragon to fight and converts all enemy tiles into special attacks for the dragon.
Dropped by the Lich only. Can only carry 1.