Hero skill trainers are a special type of skill trainer located throughout Elona. 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 and gives the skill to the character using the hero skill point, effectively allowing access to the skill for all heroes on the account.
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.
Skill Trainer List
For a list of all known hero skill trainers see the hero skill trainer locations page.