simple mod that add a new spawner to nauvis that has a 4% chance to spawn, and they will exclusively spawn stompers
Stomper spawners now have quality that is directly tied to evolution factor so they will become stronger as evolution progresses and so early game stompers are hard to kill, but not 3500 hp. HP values are the following.
Normal – 1500 HP — appears when only small biters/spitters exist (evo < 0.35).

Uncommon – 2500 HP — appears slightly after medium biters (evo 0.40–0.65). +5% spawn rate - 5% total

Rare – 3500 HP — appears between large and behemoth (evo 0.70–0.90). +5% spawn rate - 10% total

Epic – 4200 HP — appears after behemoths become common-ish (evo 0.92–0.98). +5% spawn rate - 15% total

Legendary – 5000 HP — very late (evo ≥ 0.98). +5% spawn rate - 20% total

Stompers also require 2x pollution to mobilize and attack over other biters.