Major Mutation - Sturdy Body

Your body becomes sturdy and compact, but your muscles also stiffen a bit. You gain the following traits:

Mutant Toughness. Your hit point maximum increases by an amount equal to your level when you gain this trait. Whenever you gain a level thereafter, your hit point maximum increases by an additional 1 hit point.

Stiff Legs. Your walking speed is reduced by 5 feet.