I know there are prestige classes for casters, but due to the Warlock's Invocation mechanics, I'm not sure which ones it can qualify for, or at least which ones would be beneficial for it. What are ...
As part of this Multiclass feat it tells me to: Choose a warlock pact. You gain the pact's at-will power as an encounter power, and you can pursue the warlock paragon path based on that pact. ...