How does the 'double experience' or '+100% xp bonus' from the anniversary event work with other boosts such as from higher difficulty levels?

Torment I has a base 300% XP bonus, for the duration of this event will that become 400% bonus ('+100%') or 600% XP rate ('double')?

  • 1
    Official announcement: the bonuses provided will stack multiplicatively with existing in-game bonuses, including those provided by items, Shrines, Pools of Reflection, and Paragon points.
    – Orc JMR
    Commented Mar 26, 2015 at 7:37

1 Answer 1


It's multiplicative not additive. The bonus is doubled. So for your example it becomes 600%


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