Vecna skull

The Vecna skull is a rare drop from all monsters while wearing a Ring of Wealth with any charges. It can be activated to gain a temporary +6 boost to Magic. It can only be activated every seven minutes per player, regardless of how many Vecna skulls are owned. You do not have to be on a Slayer task to obtain one. This item cannot be lent.

Monsters

 * Abyssal demon
 * Ankou
 * Armoured zombie
 * Basilisk
 * Black demon
 * Black dragon
 * Bloodveld
 * Blue dragon
 * Bork
 * Cockroach soldier
 * Crawling Hand
 * Dagannoth Rex (Possibly Prime and Supreme too, further confirmation needed)
 * Dark beast
 * Desert strykewyrm
 * Dust devil
 * Fire giant
 * Frost dragon
 * Gargoyles
 * General Graardor
 * Greater demon
 * Green dragon
 * Harpie Bug Swarm
 * Ice strykewyrm
 * Iron dragon
 * King Black Dragon
 * Kree'arra
 * Mithril dragon
 * Mountain troll
 * Moss giant
 * Nechryael
 * Nex
 * Otherworldly being
 * Steel dragon
 * Terror Dogs
 * Tormented demon
 * Turoth
 * Waterfiend

Trivia

 * Vecna is a powerful lich in "Dungeons and Dragons". His eye and hand are powerful artifacts, much like the Vecna skull.
 * The skull cannot be activated while a player under the effect a Magic Skillcape's +1 boost. (needs confirmation)