Evil temples are temples dedicated to evil gods or evil magics. They may contain sacrificial altars, torture chambers, dungeons, blood pools, and dungeon cells to hold unwilling participants. There may be cult chambers. There may be candles and magic or occult symbols. Often evil temples are located in inhospitable or threatening terrain, such as at the mouth of an active volcano, within a skull rock, or on a hidden island. They are home to cultists, evil clerics, and monsters from other realms.
Designing Fictional Evil Temples
Fictional evil temples are often located in foreboding or menacing locations. This allows worldbuilders to use the local terrain to help set the tone of the temple. Consider how the nearby environment can be used. Consider bot the local region and local terrain.
Fictional evil temples often feature elements such as altars (for sacrifices), dungeon cells (for keeping soon to be sacrificed individuals), and catacombs (for storing recently sacrificed individuals).
Evil Belief Systems
When designing evil temples, consider the god or religion for which they were constructed. Often in fictional worlds evil temples serve as a means to bring forth an apocalypse, summon a cosmic monster to this dimension or awaken them from a slumber, or fulfil or end a prophecy.