OK, I just tested this and got additional clarification on how this works. It's a little hard to explain.
So, let me correct myself here:
Say the base XP you get from an NPC is 1.
A 4x multiplier will multiply you base by 4: 1 base XP + 3 additional XP, for a total of 4 XP.
A 2x multiplier will multiply your base by 2: 1 base XP + 1 additional XP, for a total of 2 XP.
So, now let's look at how these work together.
A 4x multiplier plus a 2x multiplier will add the benefits of both of these elixir to you base XP: 1 base XP + 3 additional XP + 1 additional XP, for a total of 5 XP.
Now, let's double that for double XP weekend: (1 base XP + 3 additional XP + 1 additional XP) times 2, for a total of 10 XP.
My test validated that double XP is yielding the results described above:
1 kill with no elixir: 2 XP
1 kill with 2x week-long elixir: 4-5 XP
1 kill with 2x week-long elixir and 4x thrasher: 10-11 XP
I don't think I described this functionality properly in the past. Sorry about that!
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