Skills - Official Last Epoch Wiki
Skills are abilities used to damage foes or to aid allies in combat. For Player Characters the skills available to them are determined by their class. Skills are unlocked by Leveling up and choosing a master class. Each skill has a set Mana cost and cooldown rate, which determine how frequently they can be used. Some skills may have either no Mana cost or no cooldown. A few skills may have multiple charges, which allow for using the skill in rapid succession. Charges replenish independently...
6 skill slots is not enough - PC General Discussion - Diablo IV Forums
The 6 skill slots is not enough for how elaborate the skill trees are, and how many skills you can actually have. With the necromancer it feels like you only have 4 skills, since taking skeleton or golem off the bar de summons them. If we are really only allowed 6 abilities, the elaborate skill tree suddenly becomes very boring and limited. Many of the items that give + to entire skill sections become bad. Hope blizzard actually reads this post.
How to add affixes with Tempering in Diablo 4, plus all Temper Manuals
Tempering is a Diablo 4 system added in season 4 that allows you to upgrade gear. Here’s how it works plus a list of all Temper Manuals for all classes.