Manaless

Heroes that have no required resource for their skills.

Unlike heroes that use Mana or Energy, this hero's only inhibitor on his abilities is cooldowns.

This hero could theoretically cast all of his spells every time they were available the entire game long at no penalty. Because of this, these characters are generally very efficient harassers in the laning phase, since they can use any long range ability every time it cools down at no cost, slowly whittling down opponents who might be unable to return attacks as often without fear of running out of mana.

Items that give Cooldown Reduction are often a significant boon to these heroes.