u/Existing_Specific_63

Hello,
I recently began playing Trench Crusade, and my friend from Heretic Legions found something troubling. It feels like -3 to injury characters feel way too tough to put down to be worth it. He had cornered my Lt. with 4 models and was burning injury dice like crazy only to find that they just couldnt kill him, any advice to prevent these guys from running rampant?