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To get to Brimhaven, start in Ardougne and take with you a cheap axe (hatchet) and 905 gp. Pay for the boat ride to Brimhaven, then run south to the dungeon and pay Saniboch his 875 gp fee to enter. Go west, chop the vines, and take the second passage heading north. Go to the end, hop the stones across the lava (level 12 Agility) and run to the southwest of the large chamber. Go down the stairs and you'll find the demons. An alternative to coming from Ardougne is to teleport home if your house is in Brimhaven, then just exit the portal.
The easiest way to get to the Ogre Enclave is to run over from either Yanille or Castle Wars.
Entrana is accessed via boat from Port Sarim or via the balloon network. You cannot bring armor or weapons to Entrana, which complicates matters.
I've never fought the demons in the lava maze or demonic ruins locations, as I don't see any point given the risk of revenant attack.
If fighting in Kuradal's Dungeon, get there easily using a ferocious ring, or via the fairy ring at the waterfiends (code "B J Q").
Equipment
For melee, either granite/dragon armor or Barrows. Mid-level players on long Slayer assignments might want to bring Guthans, but high-level players don't need it, especially if using a healing familiar.
Players with extremely high skill levels should consider Dharoks: these are good monsters for it, as they are quite weak in terms of both offense and defence.
Wear standard ranging or maging gear if fighting in the Ogre Enclave, where the greaters are caged and can't get to you. It's also possible to hally them in this location. If ranging, a crystal bow is a good choice since you can't get your ammo back easily.
Obviously, be careful about what gear you bring if you go into the Wilderness!
Always wear a ferocious ring if fighting in Kuradal's Dungeon (which is only possible if these are your current Slayer assignment.)
Supplies
For meleeing, I recommend two super sets per hour, and decent to good food. For ranging, bring ranging potions and ammo, of course, and mages will need runes. Some food for rangers/mages is also recommended.
Bring about 10 or 15 nature runes, depending on what you want to alch (they drop lots of fires.)
Additional supplies will depend greatly on both combat style and the location you choose.
Familiar
Mid-level players and those who are camping at the greaters should consider using a healing familiar. I personally use a magpie here -- what it forages helps offset the poor drops of these monsters.
Combat Notes
Greater demons are good training monsters, as they have good drops and low defence, but they also can hit pretty hard if your Defence level is low, so beware. (They also have poor drops; see below).
Fighting them in Brimhaven is complicated by the presence of wild dogs, nuisance monsters throughout the dungeon that will attack you if you are below level 127. Just stay in one spot until they become unaggressive.
Ranging and maging is best done in the Ogre Enclave. If you choose this route, be sure to bring extra runes for telekinetic grab so you can snag any good drops.
The best way to fight in Entrana is to bring with uncompleted ranging supplies, which the game doesn't consider weapons, and finish them once in the dungeon.
So, for example, you could bring with a crossbow stock, crossbow string, unfinished bolts and feathers.
Like all of the monsters in Kuradal's Dungeon, the demons there can only be fought if you are on a Slayer assignment for them. Get there quickly using a ferocious ring; If you don't have a ring, use the fairy rings to code "B J Q", then run south and go up the stairs to Kuradal.
Drop Notes
Compared to other monsters of their level, greater demons have relatively poor drops. You'll get lots of fire runes -- like anyone cares -- and some other runes, a few items you can alch, a few chaos and death runes, and lots and lots of small coin drops. Greater demons have an undeserved reputation as being good charm droppers; they are a decent way to get a few crimson charms, but that's all -- just "decent".