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This is basically a repackaging of the information found at the excellent site Darkness, hosted by DiabloII.net. They have a lot of data there, go check them out. This is the concatenation of their beastiary section. Seriously, go there, they've got a lot more than what I copied below.

Up until clvl 25, you get 100% (full) experience for monsters 5 monster levels (mlvls) above and below your character level (clvl). For up to 10 levels, it's roughly:

-/+ clvl 6 - 88%
-/+ clvl 7 - 68%
-/+ clvl 8 - 37%
-/+ clvl 9 - 15%
-/+ clvl 10 - 5%

With anything beyond that staying at 5%. So if you're a level 18 Barbarian, and you're fighting Andariel (mlvl 12), that's a difference of 6 levels, so you'll only get 88% of the full experience for killing her. Above clvl 25 (presumably because it wasn't really properly balanced after normal difficulty), the experience gain roughly translates to:

XP = MonsterXP * ( clvl / mlvl )

This formula only works for monsters above you, where mlvl > clvl . If the mlvl is below your character's level, the old rule, same as up to clvl 25, applies where full experience is granted within 5 levels below you, and so on.

Characters level 75 or above have an additional penalty imposed:

• When you pass level 75 you get 1/2 of the experience.
• When you pass level 80 you get 1/3 of the experience.
• When you pass level 85 you get 1/4 of the experience.
• When you pass level 90 you get 1/5 of the experience.

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Act I	Normal Level	Nightmare Level	Hell Level
Zombie	1	34	67
Fallen	1	34	67
Quill Rat	1	34	67
Fallen Shaman	2	35	68
Skeleton	2	35	68
Hungry Dead	2	35	68
Gargantuan Beast	2	35	68
Dark Hunter	2	35	68
Dark Spearwoman	2	35	68
Foul Crow Nest	3	36	69
Foul Crow	4	37	70
Moon Clan	4	37	70
Dark Ranger	4	37	70
Vile Archer	5	38	71
Vile Lancer	5	38	71
Vile Hunter	5	38	71
Skeleton Archer	5	38	71
Misshapen	5	38	71
Brute	5	38	71
Spike Fiend	5	38	71
Griswold	5	38	71
Carver	5	38	71
Carver Shaman	6	39	72
Returned	6	39	72
NightClan	6	39	72
BloodHawk	6	39	72
Bone Warrior	7	40	73
Ghost	7	40	73
Dark Archer	7	40	73
Blood Clan	7	40	73
Devil Kin	7	40	73
Blood Hawk Nest	8	41	74
Disfigured	8	41	74
Dark Stalker	8	41	74
Thorn Beast	8	41	74
Dark Lancer	8	41	74
Returned Mage	8	41	74
Returned Archer	8	41	74
Black Lancer	9	42	75
Yeti	9	42	75
Black Rogue	9	42	75
Devil Kin Shaman	9	42	75
Razor Spine	9	42	75
Bone Archer	9	42	75
The Smith	10	43	76
Rat Man	10	43	76
Wraith	10	43	76
Death Clan	10	43	76
Black Archer	10	43	76
Blood Raven	10	43	76
Bone Mage	10	43	76
Dark One	10	43	76
Dark Shaman	11	44	77
Tainted	11	44	77
Arach	11	44	77
Ghoul	12	45	78
Afflicted	12	45	78
Banished	12	45	78
Andariel	12	45	78
GargoyleTrap	15	48	81
Act II	Normal Level	Nightmare Level	Hell Level
Lightning Spire	1	34	66
Fire Turret	1	34	66
Flying Scimitar	12	45	78
Burning Dead	13	46	79
Sand Raider	13	46	79
Dried Corpse	13	46	79
Burning Dead Archer	13	46	79
Horror	14	47	80
Sand Leaper	14	47	80
Slinger	14	47	80
Huntress	14	47	80
Dung Soldier	14	47	80
Carrion Bird	14	47	80
Burning Dead Mage	14	47	80
Spear Cat	15	48	81
Saber Cat	15	48	81
Undead Scavenger	15	48	81
Cave Leaper	15	48	81
Claw Viper	15	48	81
Decayed	15	48	81
Hollow One	15	48	81
Desert Wing	15	48	81
Mummy Generator	15	48	81
Black Raptor Nest	15	48	81
Black Raptor	16	49	82
Itchies	16	49	82
Sand Warrior	16	49	82
Sand Maggot	16	49	82
Sand Maggot Young	16	49	82
Sand Maggot Egg	16	49	82
Radament	16	49	82
Plague Bearer	17	50	83
Marauder	17	50	83
Tomb Creeper	17	50	83
Night Slinger	17	50	83
Night Tiger	17	50	83
Rock Worm	17	50	83
Rock Worm Young	17	50	83
Rock Worm Egg	17	50	83
Black Locusts	17	50	83
Scarab	17	50	83
Horror Mage	17	50	83
Invader	18	51	84
Salamander	18	51	84
Embalmed	18	51	84
Guardian	18	51	84
Horror Archer	18	51	84
Blunderbore	18	51	84
Summoner	18	51	84
Hell Cat	19	52	85
Hell Slinger	19	52	85
Crusher	19	52	85
Specter	19	52	85
Hell Clan	19	52	85
Devourer Young	19	52	85
Devourer Egg	19	52	85
Devourer	19	52	85
Steel Weevil	19	52	85
Ghoul Lord	19	52	85
Fiend	19	52	85
Unraveler	20	53	86
Apparition	20	53	86
Gorbelly	20	53	86
Duriel	22	55	88
Act III	Normal Level	Nightmare Level	Hell Level
Horror	14	47	80
Horror Mage	17	50	83
Water Watcher	18	51	84
River Stalker	20	53	86
Zakarumite	20	53	86
Fetish	21	54	87
JungleHunter	21	54	87
Sucker	21	54	87
Giant Lamprey	21	54	87
Giant Lamprey Young	21	54	87
Giant Lamprey Egg	21	54	87
Gloam	21	54	87
Thorned Hulk	21	54	87
Undead Fetish	21	54	87
Poison Spinner	21	54	87
Swamp Dweller	21	54	87
Fetish Shaman	22	55	88
Bog Creature	22	55	88
Cloud Stalker Nest	22	55	88
Cloud Stalker	22	55	88
Drowned Carcass	22	55	88
Tree Lurker	22	55	88
Dark Shape	22	55	88
Hell Buzzard	22	55	88
Hell Swarm	22	55	88
Flame Spider	22	55	88
Flayer	22	55	88
Undead Flayer	22	55	88
Doom Ape	22	55	88
Gloombat	22	55	88
Bramble Hulk	22	55	88
Faithful	22	55	88
Stygian Watcher	22	55	88
Sexton	22	55	88
Wailing Beast	23	56	89
Flesh Hunter	23	56	89
Preserved Dead	23	56	89
Horadrim Ancient	23	56	89
Winged Nightmare	23	56	89
Swamp Ghost	23	56	89
Spider Magus	23	56	89
Thrasher	23	56	89
Night Lord	23	56	89
Soul Killer	23	56	89
Undead Soul Killer	23	56	89
Cantor	23	56	89
Flayer Shaman	23	56	89
Infidel	24	57	90
Temple Guard	24	57	90
Bone Scarab	24	57	90
Serpent Magus	24	57	90
Dark Lord	24	57	90
Flesh Archer	24	57	90
Flesh Lancer	24	57	90
Undead Stygian Doll	24	57	90
Zealot	24	57	90
Heirophant	24	57	90
BloodDiver	24	57	90
Soul Killer Shaman	24	57	90
Slime Prince	24	57	90
Cadaver	25	58	91
Blood Lord	25	58	91
Mauler	25	58	91
Council Member	25	58	91
Mephisto	26	59	92
Act IV	Normal Level	Nightmare Level	Hell Level
Doom Knight	24	57	90
Doom Caster	24	57	90
Corpulent	24	57	90
Balrog	24	57	90
Flesh Beast	24	57	90
Flesh Spawner	24	57	90
Razor Pit Demon	26	59	90
Burning Soul	26	59	90
Damned	27	60	90
Blood Maggot	27	60	90
DarkFamiliar	27	60	90
Blood Maggot Egg	27	60	90
Blood Maggot Young	27	60	90
Corpse Spitter	27	60	90
Stygian Hag	27	60	90
Stygian Dog	27	60	90
Strangler	27	60	90
Abyss Knight	27	60	90
Pit Lord	27	60	90
Venom Lord	30	63	90
Maw Fiend	30	63	90
Oblivion Knight	30	63	90
Storm Caster	30	63	90
Grotesque	30	63	90
Grotesque Wyrm	30	63	90
Urdar	32	65	90
Diablo	40	73	90
Act V	Normal Level	Nightmare Level	Hell Level
Enslaved	31	64	90
Rot Walker	31	64	90
Demon Gremlin	31	64	90
Dominus	32	65	90
Death Mauler	32	65	90
Catapult	32	65	90
Reanimated Horde	33	66	90
Slayer	33	66	90
Berserk Slayer	33	66	90
Overseer	33	66	90
Demon Imp	33	66	90
Blood Lord	33	66	90
Vile Temptress	34	67	90
Vile Witch	34	67	90
Lasher	34	67	90
Demon Rascal	34	67	90
Baal Tentacle	34	67	90
Prowling Dead	35	68	90
Ice Boar	35	68	90
Consumed Fire Boar	35	68	90
Stygian Harlot	35	68	90
Stygian Fury	35	68	90
Hell Lord	35	68	90
Putrid Defiler	35	68	90
Fire Boar	36	69	90
Consumed Ice Boar	36	69	90
Overlord	36	69	90
Demon Trickster	36	69	90
Night Lord	36	69	90
Hell Spawn	37	70	90
Blood Boss	37	70	90
Frozen Creeper	37	70	90
Talic	37	70	90
Madawc	37	70	90
Korlic	37	70	90
Wretched Defiler	37	70	90
Crush Beast	38	70	90
Demon Sprite	38	70	90
Death Slasher	38	70	90
Fetid Defiler	39	70	90
Warped Shaman	40	70	90
Unraveler	40	70	90
Unholy Corpse	40	70	90
Snow Drifter	40	70	90
Ice Spawn	40	70	90
Frenzied Ice Spawn	40	70	90
Hell Temptress	40	70	90
Blood Witch	40	70	90
Moon Lord	40	70	90
Death Brawler	40	70	90
Rancid Defiler	40	70	90
Council Member	40	70	90
Venom Lord	40	70	90
Abominable	41	70	90
Greater Hell Spawn	41	70	90
Insane Hell Spawn	41	70	90
Defiled Warrior	42	70	90
Greater Ice Spawn	42	70	90
Frenzied Ice Spawn	42	70	90
Blood Temptress	42	70	90
Hell Witch	42	70	90
Death Lord	43	70	90
Evil Demon Hut	50	70	90
Minion of Destruction	55	70	90
Baal	60	70	95
Nihlathak	65	70	95

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Leveling Guide
This is a rough outline of how fast you should be going through the levels in Normal difficulty mode according to the experience table. The level indicated is your character's level. Nightmare and Hell difficulties aren't balanced properly with regards to mlvls vs. clvls, so they are left out.

Level 1:	Through the Blood Moor and most of the Den of Evil.
Level 2:	The Cold Plains and the Burial Grounds. You can skip Blood Raven and kill her later since she's level 10.
Level 3:	Nothing much to kill. Both the dungeons under the Burial Grounds are full of mlvl 2 monsters. Try the Caves under the Cold Plains.
Level 4:	The Caves and the Stony Field.
Level 5:	The Underground Passages, the Dark Woods, and Tristram.
Level 6:	You should still be in Tristram. Be careful to kill Griswold before you level up here, since he's only mlvl 5. Most of the other monsters there are mlvl 6.
Level 7:	Blood Marsh and the Forgotten Tower.
Level 8:	Tamoe Highlands.
Level 9:	You should be in the Monastery's Outer Cloister by now. If you aren't, scoot!
Level 10:	Here comes the tricky part. You'll need to get through the entire Barracks, all 3 levels of the Jails, and the Inner Cloister at this level. Don't forget to run back and kill Blood Raven while you're at it.
Level 11:	The Cathedral and the Catacombs level 1 and 2.
Level 12:	Catacombs level 3 and 4. You should be done Act I at clvl 12. Preferable to level up just as you kill Andariel, since the next monsters you face in Act II will be mlvl 13.
Level 13:	Get through the Lut Gholein sewers. Be wary of the mlvl 16 Radamant.
Level 14:	Rocky Waste, Stony Tombs.
Level 15:	Dry Hills, Halls of the Dead.
Level 16:	Far Oasis, Maggot Lair. Go back to kill Radamant if you want.
Level 17:	The Lost City, Ancient Tunnels beneath them.
Level 18:	Claw Viper Temple, back to Lut Gholein for the Harem and the Palace Cellar.
Level 19:	Arcane Sanctuary, though the only mlvl 18 monster there is the Summoner himself. Then run around in the Canyon of the Magi.
Level 20:	Tal Rasha's Tomb(s).
Level 21:	What to do? Duriel's mlvl 22, but the monsters in the tomb are only mlvl 20. Might as well kill him now, since some of the beginning Act III monsters are mlvl 20 or 21.
Level 21:	The Spider Jungle and the subsequent spider dungeons
Level 22:	Lots of locations to choose from for full experience. Great Marsh, Flayer Jungle, and all the dungeons underneath. Lower Kurast, and most of the Kurast Bazaar.
Level 23:	This level encompasses all the dungeons under the Bazaar, as well as Upper Kurast and the sublevels there.
Level 24:	Kurast Walkway, Travincal, Durance of Hate Level 1 and 2.
Level 25:	Durance of Hate Level 2 and 3.
Level 26:	Mephisto time :). When you get to hell, most of the starting monsters will be back to mlvl 24, so don't sweat it if you're not clvl 26 by the time you're in Act IV.
Level 24-26:	You should have beaten Act III somewhere between these levels. From here you should do Outer Steppe and Plains of Despair runs.
Level 27:	Start on the City of the Damned. Some bits of River of Flame as well.
Level 28-29:	River of Flame. Mind you, the Urdars there are mlvl 32, but whatever.
Level 30:	The Chaos Sanctuary. All the monsters there are mlvl 30. Except for Diablo, but no one is really expected to keep leveling till they hit 40, then go kill him.