Issue #22962: Unused Higher Difficulty Giant
With Blackpete's help it looks like I found an enchanted Giant Club that was never used by the game.
Looks like it was made for harder Giants you could face similar to Frost Giants having an enchanted club.
Absorb 15 points of stamina:
Absorb Stamina, 15 pts for 1 sec
Also may have been part of the DA06 quest but went unused.