A class trainer is an NPC who can untrain your specialization and talents (making you untalented) for a price. Untraining costs 1 the first time, then increases by 5 thereafter for a maximum cost of 50. The costs are reduced by 5 each month to a minimum of 15.
When using the tracking system with the minimap they will appear with a blue book () at their locations.
The trainer page has links to a comprehensive list of trainers for each class.
- Patch 5.0.4 (2012-08-28): "New spells are now learned automatically. Class trainers are only needed to change talents, glyphs, class specialization, or to utilize the dual specialization feature."