From the Game's Website
Knights of the Chalice is a classical turn-based, party-based CRPG, where your foes are cunning and will do their best to crush you.
Never before in a game you've seen your opponent push you into flame or align your companions in order to throw a spell at them!
This is a classical dungeon crawling RPG in a fantasy world.
Knights of the Chalice is a PC computer role-playing game (CRPG) for Windows loosely based upon the Open Game Licence 3.5 (OGL), the set of rules at the root of the popular pen-and-paper role-playing game Dungeons & Dragons Edition 3.5, made by Wizards of the Coast. However, many changes had to be made to apply a set of rules designed for a pen-and-paper game to a computer game. As per the terms of the Open Game Licence, it is clearly indicated within the game which parts follow the OGL exactly and which do not.
At the beginning of the game, you create a party of four adventurers - the player characters. Unlike some other games, you do not get to recruit companions later in the game. For each player character you choose a class - Fighter, Wizard or Cleric - and a race - Human, Half-Elf or Half-Dwarf (Mul). The characters immediately start in the tower of the Knights of the Chalice, where they receive a mission - to look for a knight who has gone missing. After this briefing, the players can explore the tower then leave the place and try to complete their mission.