Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)

Grinderfists
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Some of Throt's Stormfiends were adapted to carry warp-grinders, allowing them to create their own tunnels by vaporising soil, rock and roots alike. Once in combat, such a Stormfiend will grind at the foe, disintegrating flesh with ease.

RangeStrengthSpecial Rules
CombatsAs user-

A unit that contains a model with Grinderfists follows the rules for Ambushers. During deployment, but before Scouts are set up, place a tunnel marker anywhere on the battlefield that is not impassable terrain.

When the Stormfiends emerge, roll a scatter dice and an artillery dice. If you roll a hit on the scatter dice, the marker stays in place; if you roll an arrow, move the marker the number of inches indicated by the artillery dice in the direction shown by the arrow. If the marker is moved off the tabletop, the team and its parent unit are considered lost; treat them as casualties. If you roll a misfire, the unit is delayed and you will need to roll the scatter and artillery dice again for them next round.

Once the final position is established, place the Stormfiends so they touch the marker. If the marker is under a friendly unit or impassable terrain, place it next to the closest edge of the unit/terrain. They may face in any direction.

If the marker is under an enemy unit when the Stormfiends emerge, they count as charging. Place the attacking Stormfiends to the front of the enemy unit that is atop the marker.

Rather than attacking normally, a model with this rule inflicts Impact Hits (2D3) at the start of each round of Close Combat.

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