If you've already built up Absorption OSRS GP potions and overdoses, the only boss that could kill you is corrupt lizardman. It is best to disable him so that they can't take you down. There are bosses you can encounter that are tricky to kill but should remain active as they can give excellent bonus points. However , if you're maxed on points and want to make it easier in your dreams, deactivate them.
If you feel that one of the bosses causes you a lot of trouble but you're not going to throw away your potions to fight him, use Ultimate Force powerup. In other cases try not using it , as it won't provide you with experience in exchange for killing. To gain the maximum amount of experience and points possible player must kill the most bosses they can.
There are other bosses like Count Draynor, King Roald, Khazard War Lord, Tree Spirit, Moss Giant, Black Knight Titan, Ice Troll King, Black Demon,Witch the experiment, Giant Roc, Treus Dayth, Nazastarool, Hellhound, Kendal, Ancient Skeleton and other dangerous foes.
Your inventory setup should comprise of four to eight prayer potions four overloads, and one weapon that has a special attack orb and locator as well as a rock cake. Rest of the free inventory slots should consist of absorption potions. When you enter the dream, you should drink overdose and take the all hitpoints remaining down to 1 using wither orb and rock cake. This makes bosses hit only for 1 which can be shielded over a duration of time due to absorption potions. For the equipment you should bring highest damage output set that you own (Dharok will do the trick).
There are also numerous other OSRS Membership useful gear items that will aid 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 more. Make sure to bring powerful potions, such as super magic Super ranging, super melee.