Nightmare Zone is the best place to train combat experience in the game as many of the bosses offer a bonus experience point multiplier while also providing important rewards like imbuing rings and redirection scrolls for house teleports. There are many methods that provide incredible amounts of AFK experience points or quick experience points. The newly discovered AFK points/experience point method is also very powerful.

Skull64's post
https://www.reddit.com/r/2007scape/comments/k6n3gg/i_figured_out_how_nightmare_zone_points_are/

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AFK Points/XP Bosses
Arrg Moss Guardian Headless Beast Earl Draynor Sand Snake Ice Troll King Khazard Warlord King Roald Black Knight Titan Tree Spirit Doorman The Kendal I Black Demon Skeleton Hellhound Nezikchened Jungle Demon

Bosses with maximum experience
Arrg Mossguard Headless Beast Earl Draynor Sandsnake

Hyper AFK Bosses
Earl Draynor Sand Snake King Roald The Kendal I

Bosses with maximum score (Disable)
Corrupt Lizardman Witch Experiment Elvarg Nazastarool Dagannoth's Mother Glod Recipe for Disaster Boss Chronozon Barrelchest Slagilith Tanglefoot

0:00 Introduction
0:32 Requirements
1:22 Basics
2:16 gear
5:01 Runestone
5:39 Overview
7:52 Max XP
8:34 New mixed method
10:01 Maximum points
12:53 Hyper AFK
15:10 Ranged/Magician
16:18 Rewards

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