To do this trick, you must first have fought Battler Beetles, Puff Beetles, Magma Beetles, and Dazzler Beetles. After you have fought at least one of each type, they will be available at the Dark Tower dungeon. Battler beetles yield brown, Puff beetles green, Magma beetles red, and Dazzler beetles blue Lifeforce. You should get at least 75 Lifeforce points each time you completely kill all of the beetles that are in the dungeon.