|Effect: When equipped, Thunder Helmet increases hero's knowledge skill by +10, but reduces hero's power skill by -2.|
|A glint of golden light catches your eye. Upon further investigation, you find a golden helm hidden under a bush.|
Thunder Helmet is a relic class artifact, that is equipped in head slot.
You cannot purchase relic artifacts in Artifact Merchants.
Note: Because knowledge is a skill that is only relevant when heroes recover their mana (such as at a well), this artifact is a common candidate for artifact juggling. Simply equip the Thunder Helmet when restoring mana, and remove it at all other times, as it will only serve as a detriment by reducing power.