Warlock spell slots are different from other classes in that they have a limited number of slots, which can be increased by specializing in the Warlock’s class. The Warlock’s spell list is split up into three categories: offensive, defensive, and support.
Offensive spells deal damage or manipulate the battlefield, defensive spells protect the player and allies, and support spells help the Warlock stay alive or extend their allies’ longevity.
As a Warlock, you have three spell slots for each of your two main resource types: Mana and Energy. You also have a fourth slot for your Ultimate ability.
The amount of mana and energy you have available will determine how many spells you can cast at once, as well as how many spells you can have active at any given time.
Mana is used to cast offensive and defensive spells, while energy is used to cast support spells. Having more mana allows you to cast more spells in a turn, while having more energy allows you to cast more powerful support spells.
Each class has a different number of mana and energy points available per level, so it is important to understand how these points are distributed before choosing a specialization.
Warlocks start with 2 spell slots for each resource type at level 1, increasing by 1 for every 2 levels after that up to a maximum of 6 slots at level 20. At level 10, Warlocks gain the ability to specialize in one of two resource types: Mana or Energy.
This choice determines which two spell slots become associated with that resource type. Specializing in one resource type also increases the amount of that resource that Warlocks regenerate per minute.
For example, if a Warlock specializes in Energy they will gain the ability to regenerate Energy faster than other Warlocks. If a Warlock specializes in Mana they will still regenerate Mana but cannot gain additional Energy from sources outside of their own abilities or items.
Specializing in either Resource type does not alter the amount of spell slots that Warlocks have available for their other resource type; this is separate from their total number of slots (2+1=3). For example: A Warlock who specializes in Energy will still have 2 spell slots available for Mana casting and 1 slot available for casting offensive or defensive spells using Energy.
