[Togainu]

Dami, just looking at the Warlock class. The class itself doesn't have a caster level. However his Invocations use his level as a caster level. There is a difference here.

As an example lets take a crafting feat (Pathfinder version one at least) require you to have a caster level by class. So the Warlock class wouldn't qualify for that. Seeing native they don't have a caster level. Just that one specific ability of theirs has something that relies on a caster level as such they make a clause for it that their level equals the caster level for that ability alone.

Which is made clear by this sentence in their class "A warlock's caster level with his invocations is equal to his warlock level." It calls out specifically it only has a caster level for that ability. This is much like how the new Kineticist class works in Pathfinder (one of the reason I made a feature request for concentration/SR check modifiers for them cause they aren't shown currently).