Raise Dead
Raise Dead is an iconic spell popularized by, if not introduced in, Dungeons & Dragons. It is essentially the /tg/ equivalent of a Respawn, a spell that can be used to bring a deceased adventurer back to life and allow a player to continue playing their original PC, instead of having to generate an entirely new one. This is actually a contentious little spell, because some DMs disapprove of it either for its potential impact on world-building, or because they feel it lowers the investment in the game.
Traditionally, Raise Dead is part of a small sub-family of spells, usually accessible by Clerics. In addition to beefier versions like Resurrection and True Resurrection, it also has a cousin in the form of Reincarnate.