@LionheartedCharacter sounds cool. And we do not. If its a Voodoo warlock you will use regeants, if its a Hive warlock you won't need anything to cast the spells. They are largely spontaneous. The three of us had a discussion about the level of creative liscense Hushed wanted and we decided it was best to put a bigger chunk in the players hands.
Hushed and Arena will correct me if I've misspoken