Comment by hellomynameis It has been proposed on forums that this buff will be more beneficial at higher levels, since then 50% would give more xp. But when you think about it, you will get xp 50% faster for 1 hour no matter what level you are. You will basicly save 30 minutes of leveling no matter what level you are.

We can messure it in XP, or levels gained, or time saved. If you want to gain as much xp as possible from the buff, save it for higher levels. If you want to gain as many levels as possible while this buff is active, then do the quest at lvl20. If you want to save time, then it really doesn't matter what level you use it at, you will save 30 minutes of the average time it takes level at that level for 1.5 hour, therefore going through the content in 1 hour instead of 1.5 hours.

Now, if you want to make good use of the buff, have 10-15 quests lined up within one quest hub and deliver them all when you get this buff.

We can messure it in XP, or levels gained, or time saved. If you want to gain as much xp as possible from the buff, save it for higher levels. If you want to gain as many levels as possible while this buff is active, then do the quest at lvl20. If you want to save time, then it really doesn't matter what level you use it at, you will save 30 minutes of the average time it takes level at that level for 1.5 hour, therefore going through the content in 1 hour instead of 1.5 hours.

Now, if you want to make good use of the buff, have 10-15 quests lined up within one quest hub and deliver them all when you get this buff.

What's NOT obvious is that the duration stacks - that is, if you complete the "every 10 levels version" and then a daily back to back, the durations will add together, so two of them will give you two hours worth of Enlightenment, etc.

Not sure if there's a cap yet.

EDIT: A few more quirks of this spell.

PS: Don't join a battleground or log out when it's stuck on 0 seconds, or it will be removed.

Edit: That's 7% free mastery for anyone crunching numbers.

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Enlightenment - Spell - World of Warcraft - Wowhead