Potion of Storm Giant Strength

Potion, minor, legendary

When you drink this potion, your Strength score changes to 29 for 1 hour. The potion has no effect on you if your Strength is equal to or greater than that score.

This potion’s transparent liquid has floating in it a sliver of fingernail from a storm giant.

Source: Dungeon Master’s Guide p. 187. Available in the SRD