When each turn ends, if one of your units attacked a unit in a different arena last turn, choose one: Pay 2 Force, discard a card with printed build cost X from your hand Discard a Location with printed build cost X or less from any arena. Or: Remove a card from your discard pile from the game Choose an arena with a Location. Do X dice of damage to a unit in that arena, where X is the printed build cost of the Location in the chosen arena.