Cleon
Legend
We could borrow this precedent as well:
Size Change (Su): At will, spriggans can change their size in a fashion similar to the effect of an enlarge person spell. The size change from Small to Large gains +8 Strength, -4 Dexterity, +6 Constitution and -2 attack bonus and Armor class. A spriggan's short sword has the same attributes as a Large short sword when enlarged. An enlarged spriggan is unable to make a sneak attack or use its spell-like abilities.
It's a good idea changing the name from Enlarge, since that's used for a spell, but I'd like to keep my previously proposes stat changes (+4 Str and +1 NA) and just swap the name.
Shall we use Size Change or Increase Size?