Spider Webs

 is an NPC-only physical mutation that many arachnids possess.

This mutation grants the "Spin Webs" activated ability, which allows a creature to spin webs, creating one, or one if the creature is phased, in any tile they move into. Each use of the mutation will allow a creature to create 4 webs.

The webs created with this mutation will cause creatures that move into them to become stuck. Creatures have the opportunity to make a Strength save with a difficulty of 15 + mutation level against becoming stuck. Creatures that weigh more than 320 + 80 x mutation level will be unable to become stuck in the webs. Creatures that possess this mutation are unable to become stuck themselves.

This mutation is similar to, but not to be confused with Spinnerets, which is obtainable by the player.