Clerics are valuable members of an adventuring party in these games. Most systems give the cleric healing powers to heal wounds suffered by player characters in the games, and sometimes, to raise characters from the dead. In most systems, clerics also enjoy powers to banish the undead assailants of the adventurers. Many games also allow evil clerics, the followers of evil deities, who wield similar but contrary powers to bring poison and disease against the adventurers, and who create undead armies to oppose them.
Clerics operate under a number of restrictions. They typically must retain the alignment appropriate to their faith, and may lose their clerical powers if they stray from an approved code of behaviour. Many must tithe their adventuring treasures to a temple or similar institution. In many systems, clerics are restricted in the sort of weapons they can bear; the most common restriction forbids the use of edged weapons such as swords.