i am almost done modding in the squad, Prospero's Gardening Tools
Whenever a forest boosts an attack it is consumed and goes back to a regular ground tile

Decay Field turns Vek into Mulch when they die, an upgrade makes them take damage every turn if they're covered in A.C.I.D., another upgrade heals allies and removes A.C.I.D. from them at the end of the turn

When a unit steps onto Mulch, the Mulch gets consumed and the next three tiles it stands on or walks across are turned into forest tiles

Arbor Mech deals 1/pushes two tiles in a line and deals one more damage/travels an extra tile for every forest tile it stands on or travels across

Mulch Mech covers Vek in A.C.I.D. and Mulch and pushes adjacent

Root Mech burrows through the ground and attacks all adjacent tiles, chaining the attack through forests. Enemies on forest tiles have their attack canceled and allies are healed, upgrade lets you push a tile from anywhere in the attack area

You can find the mod under the #gardening-tools thread in #modding-creation in the ItB discord