Pyramid
Pyramid is an Adventure Map location, which is guarded by a stack of 40 gold golems and two stacks of 10 diamond golems. After defeating the guards, he will learn typically a fifth level spell provided that he has Expert Wisdom and a spell book – if he does not, the spell is lost forever. If the hero retreats or dies during the battle, the already defeated golems are replenished (unlike in creature banks). Searching an empty pyramid decreases hero's luck by 2.
A curious detail is, that in the version 1.2 of Restoration of Erathia, a hero could recieve a message that he has learned Fear spell from the pyramid. However, no such spell was added to the spell book. This anomaly was removed in the version 1.3.