Can this stuff be cured/removed?

Starting at about 87% and then every 12% health after, four raging beholders (hit for ~2200; rampage; flurry; unmezzable; unsnareable) spawn in the hallway leading to her room.
The spell Sullon's Plague is cast on everyone every three minutes.
One of Sullon's Ferocity or Sullon's Vengeance or Sullon's Wrath are cast on four random people every 90 seconds. After about 10 seconds, those who are inflicted with those spells will AE the same effect on all those around them (the range is large - about 300).
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Battleworn Symbol of Rage
Glowing Orb of Rage
Last Blood
Roughcut Band of Rage
Roughcut Ragestone
Scorched Wand of Rage
Spiked Cudgel of Rage
Spiked Faceguard of Rage
Tattered Belt of Rage