2003 · ソースブック（プレイを拡張するルール／オプション）

The Weekly Delver Volume 43, Issue 1

This fantasy roleplaying supplement introduces earthquakes as a recurring hazard on Thraxis, caused by the massive moon Arril. It outlines how the Game Master determines an earthquake’s strength and applies damage to buildings, roads, and other structures each round. As structures weaken, debris can fall on characters nearby, while fissures may open in the ground and expose areas to lava. Characters are safest in the open or inside a structure, but must avoid loose, heavy objects and make Reflex saves when threatened by falling debris.