Demon Flash Mob

Demon flash mobs are a members-only feature that was released on 28 January 2013. Flash mobs appear hourly in one of 14 locations including the Wilderness, Edgeville Monastery, Menaphos, and Lumbridge Swamps. Players with the required combat level get a notice of demon energy surging at a specific location fifteen minutes before the hour and receive a second message on the hour stating that the demons have spawned in that location.

This flash mob consists of a demon boss, two black demons, 4 lesser demons and 6 imp heralds. Once the minions are killed, the boss can be attacked. At the start, however, the lesser and black demons, as well as the demon boss, are invulnerable. To attack the lesser demons, all the imps must be killed. To attack the black demons the lesser demons must be killed. To attack the boss the black demons must be killed. The boss begins with 50% of his maximum lifepoints, that is, 240,000 out of 480,000. The boss regains his lost health by feeding from the life of his lesser demons, where he heals 3000. After the imp heralds are slain, the boss will focus on his black demons, where he heals 6000 from them until they die.

Note that the demons are not aggressive. Therefore, one should look carefully for leftover demons. The next level of demons can be attacked when the boss himself says a quote. For example, when all the imp heralds are slain, the boss will say a quote, and then the lesser demons can be attacked. However, if the lesser demons are sent to battle and the boss drains the life from the black demons, the boss will be attackable. However, the boss will not attack nearby players until someone attacks him.

Attacks vary depending on the region. Non-wilderness and Wilderness demons tend to focus on one person with melee or magic attacks depending on the player's distance. Non-wilderness demons can use multi-hitting magic attacks if there is a large amount of players at the site.

The sign that a flash mob is arriving is an evil symbol on the ground. The evil symbol is where the boss will spawn. Right next to him will be his minions.

The name of the boss is random. The titles before and after its name will hint at its abilities, as detailed below. This is how the name of the boss will always be shown: "(prefix) (name) the (suffix)", meaning a name such as "General Acidius the Glorious". According to the names shown below, this means this demon boss has very accurate melee attacks and can stun players. Demon bosses of all sorts will use melee and magic attacks. Their magic attacks are multi-targeting, and melee attacks are against one player.

Prayer of any sort is not recommended. Doing so results in the boss dealing extremely deadly hits towards praying players, especially if the boss is an executioner type. Do not bring any item you can not afford to lose when the mob spawns in the Wilderness. One should be careful of the "Frostborn" type as this means players will be constantly stunned, even with the use of Freedom and Anticipate.

Prefixes
The boss of a demon flash mob will have a prefix to his name. This prefix determines the attacks the boss will use mainly, or what it is particularly good at.

Suffixes
The boss of a demon flash mob will also have a suffix to his name. This suffix determines what special abilities this boss demon has. Frostborn variants are extremely dangerous to all players.

Main names
A boss demon in a flash mob will have a main name, which can either be aligned to Zaros or Zamorak. This name doesn't have any further use.

Locations
A new flash mob spawns every hour. The location is given in the chatbox 15 minutes in advance. However, some of them may not be specific, such as "South of the Wilderness dragons!" If this happens, use the locations below to find out where the demon and his raiding party will spawn. A demon symbol is also visible on the world map.

Wilderness mobs
Due to some drops being only available in the Wilderness and the increased value of drops, and due to the need to take good quality weapons and amour to fight the demon mobs, PKers and PKing clans are hunting players who are hunting demon mobs.

Within 2 days of release, some clans began targeting demon mob clans, infiltrating them in order to arrive at the flash mob and kill players once they received drops from the demons. Players may feel safe because some of the flash mob locations are within easy distance of the level 20 teleport boundary. However, stuns and teleblocks are often used to prevent players from escaping.

Players should be aware of the increased risk when deciding whether to hunt flash mobs in the Wilderness and what items to risk.

Also, because the demon boss hits extremely hard on players using prayers, the use of the Protect Item prayer is NOT RECOMMENDED unless you want a quick death. This makes killing demon mobs in the Wilderness very dangerous. Therefore, you should take cheap weapons and food to avoid losing millions of coins. This has been proven.

Drops
In order to receive a drop, the player must deal at least 500 damage to the demon boss in a single hit, once this condition is met a notification will be given to the player. The player must also stay in combat with the boss, until it dies to be eligible for the rewards. If the player leaves or dies, the hit of 500 damage needs to be done again to still get a drop. The drop will appear under the boss.

Fighting a flash mob in the Wilderness gives you a greater chance of getting a demon slayer gear drop, and other drops will be worth around three times as much as other spawn locations.

Demon slayer gear is dropped alongside the drop it was going to give you. For example, a player that receives an Off-hand demon slayer crossbow can also get any of the common drops it gives.

100% Drop

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Armour

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Weapons

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Charms
3 charms are dropped at a time. Unknown which charm seems to be the most dominiant.

Herbs and Seeds

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Logs

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Ores, bars and gems

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Miscellaneous

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Strategy
The following items are recommended for a player's inventory:
 * Many high quality food items.
 * A one click teleport, such as a tablet, can be useful for getting away from the demon quickly. If the mob is gathering near Port Phasmatys and the Ectophial was used to get there, it can double as the escape teleport.
 * An anti-poison potion may be helpful if the demon has either the suffix Corrupting or Pestilent.
 * If the mob gathers in the desert, take water skins or other source of water.

Trivia

 * The demon boss is immune to Monster Examine.
 * Despite having a name of its own, when looking at the combat interface (two swords), the name of the demon is shown as "Demon boss".
 * The time of each demon spawn seems to vary in each world. Therefore, with fast timing, one can get multiple demon kills.
 * The timer seems vary all the time. For example, on some worlds there was a slight delay before the demon spawned on the first day. The second day, some worlds had demons spawn at the hour. The third day, the demons seemed to have a delayed timer.
 * The Evil circle can turn non-exposed parts of a player invisible. This only works if you look at someone else with the circle in the way.
 * Despite dropping Infernal ashes, which are dropped by archdemons of various types, it is classified as a Greater demon on a Slayer task. The same also affects K'ril Tsutsaroth and Tstanon Karlak.
 * Dying to the demon while using prayers seems to make you fall to the ground and look as if you are choking to death.
 * If using any prayers at all, the game box will say "The demon is targeting you because you are praying! Turn your prayers off to avoid being hit hard." This includes even the simplest of prayers such as Protect Item, and may be an oversight from Jagex as this can cause millions worth of loss in the Wilderness.