Hero skill trainers are a special type of skill trainer found in Guild Wars Nightfall and Guild Wars Eye of the North. A hero skill trainer is easily recognizable by the "[Hero Skills]" suffix in their name. Using a hero skill point to acquire a skill from a hero skill trainer unlocks the skill for the game account, effectively allowing access to the skill for all heroes on that account.
In addition, if the character does not already know that skill, the character will also learn the skill, regardless of the current primary or secondary professions. If you learn a skill outside of your current professions, they are available when you switch to the appropriate profession.
The list of skills offered also includes skills already unlocked on your account unless the character visiting the hero skill trainer has the skill, so be careful to check that you really need the skill before using a hero skill point.
Hero skill trainer list
For a list of all known hero skill trainers see the hero skill trainer locations page.