Mechanics

Cooldown Reduction
Cooldown Reduction has a limit of 33%, it stacks additively from Talents and Gems, except for Prismatic gems which are applied separately and do not affect the 33% cooldown reduction limit.

Cooldown Reduction formula:


 * Because Cooldown Reduction is a negative number, the function MAX will use the value closest to 0.
 * For Prismatics that increase the cooldown rather than decrease it the "+" can be omitted.

For example, Gunslinger's Boom Shot has a cooldown of 8s, with 25% cooldown reduction and the Prismatic gem Boom Shot Cooldown, the formula would be:

Ultimate Accrual

 * Ultimate Accrual does not have a limit, it stacks additively from all sources.
 * Spells give 0.25% ultimate charge per 1s of the spell's cooldown, when it is cast. Basic attacks give 0.5% ultimate charge per hit per 1s.
 * Cooldown Reduction Talents do not reduce ultimate accrual, the spells give less ultimate charge because their cooldown is lowered.
 * Spells with stacks such as Bastard Cleave and Transcendent Blast do not give more ultimate charge with more stacks.

Ultimate Accrual formula:

For example, Demon Hunter's Binding Circle has a cooldown of 20s, with +40% ultimate accrual, the formula would be:

Potions

 * Potions heal for 60% health. (The flat heal value may differ by ±6).
 * The maximum amount of potions that can be carried at once is 3.
 * The amount of potion crates in a mission is determined by the Ultimates of the heroes, up to a maximum of four, potion crates do not spawn in room 1, 4 or the boss room.
 * When a potion crate is opened, all players will be granted 1 potion, regardless of if they are downed, if a player already has 3 potions they will not receive another one.

Downed

 * If a hero loses all their health, they will enter a downed state where they are unable to perform any action other than slowly move.
 * If a player is downed when an objective is won by the heroes, they will be instantly revived.
 * If all non-downed players enter a new room, any downed players will teleport into that room after a few seconds.
 * With the talent "You are invisible to the Veil Demon while downed", you will still be visible to the Veil Demon, but the Veil Demon will not be able to see your downed or revive icon.
 * With the talent "You are invisible to the Veil Demon while reviving an ally", you will be while reviving, but the Veil Demon will be able to see that the downed player is being revived (Unless the downed player has the invisible while downed talent). Because you are stealthed while reviving, you will also not be targeted by Creatures.
 * After being revived the player will instantly receive 30% of their maximum health, if they have a potion it will be consumed and heal them for an additional 60% (90% total).

Time to revive:

If a revive is interrupted, the downed player's revive bar will decay at a rate of 1.48% per 0.1s (6.75s for a 99.9% revive to decay to 0%).

Impact

 * If a hero or creature takes enough impact in a short amount of time, they will be or.
 * Bosses can be knocked down, but not knocked back.
 * Impact damage is bonus damage done to objects, it is a flat amount different for each Spell and basic attack, it is not affected by or damage fall-off.

Mission Rewards
During a mission, the first equipment drop will always be for your current School, any drops after that will be from any School.

Objective
Killing Enemies progress see the table below Table is per enemy so killing 4 grunts is 10% progress killing 4 grunts and 1 elite = 35% To win the objective you need 100%

Collect Veil Beacons to collect them you need to pick them up see the table below for how many a Creature drops per kill You need to turn in 40 to win the objective.

Possessing
The Veil Demon's Possess Creature spell will give 1000 to Creatures. the health bonus is removed on de-possess.

Possessed Boss NPC will receive a buff.