Gretchin Mobz

Gretchin who fail a Moral check caused by enemy shooting or tank shock or which fail to regroup after falling back from close combat the grots "go to ground." Remove all of the gretchin models from the board. If no slaver is present the mob is destroyed. If a slaver is present they remain on the board and attempts to regroup each turn, even if the Gretchin mob had been reduced below 50% starting strength or the enemy are within 6" 
The slaver trying to regroup the Gretchin mob cannot move, shoot or initiate an assault, but can be shot at or charged. They fight back in close combat as normal. If the slaver is killed the Gretchin unit is now destroyed.

If a Grot mob is in difficult ground any Ork mobs moving through the same difficult ground my re-roll the dice for how far they move. Mega Armored Orks may not use this ability.

Any Ork mobs which are shot at "through" a Grot mob can claim a 5+ cover save. Each successful save causes a Grot to be removed as a casualty.

If a Grot mob moves into a minefield remove 3D6 Grots as casualties and then remove the minefield marker. If there are fewer Grots remaining in the mob than the rolled dice than the Grot mob is destroyed and the minefield is not removed.