Boss as a Level based XP Elixir

[FluffNStuff]

And if you didn't use an elixir?

The boss is acting as an elixir, it would stack with an elixir. Consider the example.
You kill 50 mobs to get to the boss and get 2 experience points each, so you gain your normal 100 experience. But you ALSO bank 25 experience, since that is 25%. When you kill the boss, you get that 25 experience. IF you had a 50% elixir, you would have gotten 150 experience, so you have banked 37.5 experience. You would then get that 37.5 experience when you kill the boss.