How do I turn a size Small Halfling into a size Large combatant?
I am a GM and the PCs are Level 4. I want to throw the PCs a curve they are not expecting, while keeping it “mid-level” (not Mythic nor Epic). This is for an NPC.
The Enlarge Person spell says:
This spell causes instant growth of a humanoid creature, doubling its height and multiplying its weight by 8. This increase changes the creature's size category to the next larger one.
Enlarge Person also says:
Multiple magical effects that increase size do not stack.
The Polymorph spell says it functions like Alter Self. Alter Self says:
When you cast this spell, you can assume the form of any Small or Medium creature of the humanoid type.
Does that mean RAW my Halfling can somehow take a potion of Alter Self to become size M, then a potion of Enlarge Person to become size L? I suspect this is not intended to work.
While I would like the NPC to be a humanoid when Large, it could be another creature type.
What are the options to go up 2 sizes, RAW, without getting into spells of levels 7–9?
(I thought Duergar had this ability, but they start at size M, not size S.)