I've received conflicting info about XP stacking, so I decided to run some quick tests to see for myself. I've found This post helpful for understanding XP stacking in the past. However, it was created before pet and set XP bonuses, so I wanted to test if these XP bonuses stack as well. I've included my results below and my methodology and conclusion following my data:
Trial Type Expected Total XP Observed Total XP Kills Total XP XP/Kill Base (no modifiers) 1X 1X 40 53 1.325 Pink 3Pc Valentine's Set (2.5X) 2.5X 2.26X 40 120 3 Pink 3Pc Valentine's Set (2.5X)+Zeke (3X) 4.5X 4.57X 40 242 6.05 Pink 3Pc Valentine's Set (2.5X)+Zeke (3X)+Daily 2X combo elixir (2X) 5.5X 4.98X 40 264 6.6
Methodology:
For each run, I would enter The Legend of Ebonthrax I: The Isle of Night and run solo. I would deplete the total enemy count from 81=>41 for a total of 40 enemies defeated. This was done as a lvl 105 with enemy threat level yellow.
Conclusion: These trials show that the XP bonuses from non-vanity sets, pets, and daily elixirs all stack. I observed different multiplier values than were expected, but each additional XP bonus did increase my XP/kill value. Because visible XP counts are whole-numbers instead of decimals, my values may be somewhat inaccurate d/t using display XP values in my XP/kill calculation. Going forward, I'm interested in testing if multiple set XP bonuses can be applied concurrently (e.g. if XP bonuses from Valentine's set and Toy Man set will both apply if both sets are worn since one is vanity and one is non-vanity). But I need to get my hands on a Toy Man set first :) . Hope this helps.
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