Hope devourer

Hope devourer is a Dungeoneering boss monster that can be fought on the Warped floors of Daemonheim, beginning at floor 51. It requires a Dungeoneering level of 101 to encounter and fight. This boss monster is the highest levelled behemoth of Daemonheim. It resides closest to the Rift of all its kind.

The fight
The behemoth has four main modes of attack: the first is its aura attack, a special ability that deals damage to all players in the room, as well as lowering their combat skills, but which can be blocked with the use of Protect from Magic or Deflect Magic. The aura hits at regular intervals, always dealing the same damage depending on the behemoth's combat level.

The second attack is a normal (but extremely powerful and accurate) melee attack that can be halved by praying melee.

The third attack is a special 'knockback' attack that hits through prayer, as it is typeless, dealing set damage and decreasing the target's Defence. This attack always deals 25% of the player's maximum health.

The fourth attack is a special prayer-eating attack that only hits players using protect prayers, again dealing massive damage, disabling protection prayers, healing the boss, and increasing its attack, strength, and defence. This attack is preceded by the beast roaring, so experienced players can avoid it by turning off their protect prayers quickly.

The boss's fifth attack is the standard stomp attack that all behemoths use on players who stand under them. The Hope devourer's stomp attack deals damage equal to 1/6 of the target's maximum life points.

All of these attacks, except for the aura attack, can easily deal 1,000+ damage.

Strategy
The Hope Devourer, unlike almost any other boss in Dungeoneering, is unable to walk over players. Also of significance, it will prioritize one player (people without melee prayer get targeted more likely) and try to melee that player as long as they continue to attack it. Thus, it's possible to have the priority player 'hide' behind another player (the blocker) and essentially safespot the boss.

Note that it may be best for the blocking player to not attack the boss, as the boss will switch its focus to one of the other players attacking it if the priority player stops attacking to eat. If the Hope Devourer uses its knockback attack on the blocking player (which is possible), the formation may completely disintegrate.

Trivia

 * Marmaros (the rewards trader) barely survived an encounter with this boss; it was what made him so terrified of everything around him.
 * One of the walls near the entrance to the boss chamber originally bulged out, allowing players to safespot the boss. An update by Jagex fixed the wall, making this impossible.

Hope devourer Devorador da Esperança