I'm looking for ways to make the Warlock feel more flexible with his castings, and I like this solution, especially since it's limited by how few spellslots Warlocks have of higher level spells (essentially 1 for 6th level+).
Here's my proposed stipulations:
- The Warlock can choose any spell he currently knows to cast at the level of Mystic Arcanum that he currently possesses (e.g. Cloud of Daggers, using his 6th level Mystic Arcanum.)
- That Mystic Arcanum usage could only be regained upon long rests, a la RAW.
- The Warlock would still only choose one spell per Mystic Arcanum that they learned.
- The Warlock would also be able to 'upcast' his lower level Mystic Arcanums, should they allow it (e.g. Create Undead, at level 9).
Would this break the Warlock class in some way or have an overall negative impact if I allowed this?
For further clarity, the player has a Fiend Patron with a Pact of the Chain boon.