Warrior Monks train their minds and spirits as well as their bodies. This gives them the ability to manifest spell-like effects by channelling Kremm.
Warrior monks are treated as Rouges for purposes of spell casting, learning spells, using magical items and spell foci, etc. The diffference is in how they obtain more spells. Instead of buying spells from PC Wizards (or Thieves' Guilds and the like) Monks obtain new spells from mastering inner discipline and training at temple monestaries. This training is accompanied by donations of 1,000 GP x Spell Level for each new spell ability learned.
Unlike Rouges Monks do not start play knowing any spells.