When a monster is outside your EXP penalty threshold, it gives less EXP.
The farther a monster is outside your threshold, the less EXP it gives.
At low levels, small level differences can reduce EXP sharply.
At high levels, the same difference has a smaller impact.
Very Roughly:
1 level: 5-10% penalty
2-3 levels: 20-50% penalty
4+ levels: 60+% penalty
Up to level 65, the following multiplier determines the percentage of a monster’s base EXP that you receive:
Where effectiveDifference is the # of levels you are outside the threshold.
This is a slightly modified version of the PoE 1 penalty formula. Click here to see the data that I used to derive this formula.
Act 1
Great EXP Zones
The Red Vale
Cemetery of the Eternals
Tomb of the Consort
Hunting Grounds
The Manor Ramparts
Recommended Level
I recommend being close to the following levels when entering these areas:
The Grelwood - Level 2
The Red Vale - Level 2
The Grim Tangle - Level 4
Cemetery of the Eternals - Level 5
Tomb of the Consort - Level 6
Mausoleum of the Preator - Level 7
Hunting Grounds - Level 7
Freythorn - Level 8
Ogham Farmlands - Level 9
Ogham Village - Level 10
The Manor Ramparts - Level 11
Ogham Manor - Level 12
End of Act 1 - Level 13 (or 14 for level 5 skill gems)
Zone Order
When you get to the hunting grounds, you have a couple of options. Generally, I recommend the following:
Hunting Grounds
Ogham Farmlands *
(Enter Ogham Village and then) Checkpoint to Hunting grounds and enter Freythorn
Go back to Ogham Village
Other Tips
The monsters in The Riverbank, Clearfell, and The Grelwood give LOW exp. Skip all the monsters and go straight to The Red Vale.
There is a guaranteed magic pack in The Manor Ramparts next to the guaranteed support gem.
* If you're not level 9 at Ogham Farmlands, do Freythorn first. Freythorn is a level 11 zone, so you only need to be level 8. Once you complete Freythorn, proceed as normal.
Act 2
Great EXP Zones
Buried Shrines (guaranteed magic packs on the bridges)
Deshar
Spires of Deshar
Dreadnought / Dreadnought Vanguard
Recommended Level
Vastiri Outskirts - Level 13
Mawdun Quarry - Level 14
Mawdun Mine - Level 15.5
Traitor's Passage - Level 16.5
The Halani Gates - Level 17.5
Keth - Level 18.5
The Lost City - Level 19
Buried Shrines - Level 20
Mastodon Badlands - Level 21
The Bone Pits - Level 21.5
Valley of the Titans - Level 22.5
Titan Grotto - Level 23.5
Deshar - Level 24
Path of Mourning - Level 25
Spires of Deshar - Level 25
Dreadnought - Level 26
Dreadnought Vanguard - Level 27
End of Act 2 - Level 28.5
Zone Order
Keth / The Lost City / Buried Shrines
Mastodon Badlands / The Bone Pits
Valley of the Titans / The Titan Grotto
Other Tips
It's very difficult to have problems with EXP in the first half of Act 2, but very easy to struggle in the second half. For that reason, pay extra attention to your level from when you enter Buried Shrines and onwards.
To reach level 26 in Spires of Deshar and avoid getting an EXP penalty, you'll need to be around level 25 entering Deshar. This is very difficult (in fact, you're probably killing TOO many monsters if you are 25 entering deshar). So don't worry too much if you're only level 25 entering Spires of Deshar.
Act 3
I'm not as knowledgeable about EXP in act 3, as most of my experience is in races where we usually stop taking EXP early act 3. So read the rest of this guide with caution.
Great EXP Zones
The Azak Bog
In The Azak Bog, there is a big open area where you can get a fire resistance and rarity buff. You can clear the monsters in that area, reset at checkpoint, and then farm the monsters again. This is one of the fastest ways to level throughout the entire campaign. It's highly recommended you farm this until at least 31.5, maybe even 32 or higher.
Avoiding EXP Penalty
Right off the bat in Act 3, it's very possible you're going to be on the edge of having an EXP penalty. Here's what I recommend:
Enter Act 3 at level 28.5 or higher
Reach level 29 in Sandswept Marsh
Try to reach at least level 30 by the time you finish both Jungle Ruins and The Venom Crypts
You should be able to hit level 32 by completing Infested Barrens and farming Azak Bog
If you did the above, you shouldn't need to worry about EXP for the rest of the act
End of Act 3 - Level 41
Zone Order
Jungle Ruins
Venom Crypts
Infested Barrens (pick up Chimeral Wetlands waypoint / checkpoint)
Azak Bog
Chimeral Wetlands
And then when you get to The Drowned City:
The Drowned City
The Molten Vault
Apex of Filth
Other Tips
Once you reach level 32, the EXP penalty threshold increases by another 1 level. This means you can be 5 levels below zone level, which makes things a lot easier in the second half of Act 3.
Act 4
Great EXP Zones
Isle of Kin
The Excavation
Recommended Level
Passive Points Island (Kedge Bay in 0.4) - Level 41 (First Island)
Whakapanu Island / Singing Caverns - Level 42 (Second Island)