Major Mutation - Gelatinous Body

Your body tissue and bones become more flexible than they usually should be. You gain the following traits:

Flexible Physique. You can move through a space which would allow a tiny creature to squeeze through without squeezing.

Soft Tissue. Your body is made of soft tissue, which is less dense than a normal body. Your hit point maximum decreases by an amount equal to your level when you gain this trait. Whenever you gain a level thereafter, your hit point maximum decreases by an additional 1 hit point.