If you've been to the this nightmare zone to increase your knowledge from Skyzhay's blog

Your inventory setup should comprise of OSRS gold prayers of 4-8, four overloads, one weapon with special attack orb and locator as well as a rock cake. The remainder of your slots in your inventory should contain absorption potion. Once you are in the dream world, you is advised to drink overload and reduce the all hitpoints remaining down to 1 with wither locator orb as well as rock cake. This causes bosses to hit only for 1 which can be shielded over a longer time because of absorption potions. For the equipment you should have the highest output of damage that you have (Dharok works very well).

There are also numerous other powerful gear items that can assist you in battle : Berserker Ring, Seers Ring, Archers Ring, Abyssal Whip, Salve Amulet, Warrior Rings, Void Knight Set, Ardougne Cloak, Anti Fire Shield, Proselyte Armour, God Book, Granite Maul, Amulet of Fury and many others. Make sure you have potions like super magic Super ranging, super melee.

If you've been to the this nightmare zone to increase your knowledge of afk training, this section is perfect for you. To begin, you need to go to one of the corners in the nightmare to make sure that bosses cannot reach you (remember you'll need melee bosses to get it to work).

If you are looking to absorpt with old school runescape buy gold regular overload / absorption combo , keep in mind that the effects will last for about five minutes. There is also way for you to extend this to 20 minutes by using super combat potions instead of overloads. For those who want to remain AFK for longer, it's possible to fight bosses on an easy mode using Guthan timer set to 20 minutes but it is not recommended as it doesn't provide enough gaming experience.