Wondering how to get moxxi's endowment at higher levels

I saw on the wiki that the best moxxi’s endowment gives +10 experience during fighting. I was wondering how to get the plus 10 one.

Maybe, but there wouldn’t be much point as you’d already be max level. It’s a useless item near or past 72. There’s plenty of ways to level though in the game. Maybe just pick a DLC you haven’t played as much and do all the main and sidequests in it.