Whenever there's (skill) written after the description of a skill, it means that that particular skill is an active one. Meaning there's a hotkey assigned to it in which you have to click in order to benefit from it's effects. There's a duration and cooldown timers tied to each of these skills.
Note: Monsters without Duration/Cooldown columns on their tables do not possess active skills.
Duration of skill can be extended with Pearl Necklace (+5 sec for each one).
Important: Certain skills have the (near) exact name (noted in parenthesizes after the semicolon) of an upgrade, but these are not related. It is assumed to be slips/bad naming from the developers.
Carl the Monolith does not have any skill upgrades.
Double active skill effect for 150 seconds (skill #5; Son of the Lich)
2 minutes 30
Add 50% to The Black Lich DPS
Note: Son of the Lich skill does not change other active skills' descriptions. You can activate this skill before, or after, your other active skills - the order of activation does not matter. Jeahra (talk) 13:37, April 24, 2016 (UTC)