You and all allied creatures in combat gain bonus to attack rolls depending of the amount of stacks of Tremor - Distribution up to stack of Tremor divided by amount of allied creatures in combat(rounded down) with a maximum up to +3. In order to gain any bonuses from Tremor - Distribution, at least half of allied creatures need to have stacks of Tremor - Distribution. Stacks of Tremor - Distribution halves at the start of your next turn.