Grenade Impeller
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The Grenade Impeller is a device found in Wyrm's Rock Fortress that will fire a 
Concussion Grenade at enemies that move in front of it.
Involvement edit
The Grenade Impeller' only become active during combat. After firing a 
Concussion Grenade, the grenade impeller gains 
and becomes disabled for 1 turn.
Concussion Grenades gain 
after being left on the ground for one turn. Picking up the grenade in this state will lead to it exploding in the owner's inventory at the start of the next turn.
Concussion Grenades gain 
on Tactician or Honour Mode, preventing them from being picked up entirely.