Dragonwrath, Tarecgosa's Rest

Dragonwrath, Tarecgosa's Rest is a offensive caster staff, with bonuses that are not particularly attractive to healers.

Source
It is rewarded by an epic questline that challenges those daring enough to complete it. The great staff duplicates destructive magics, and also bestows upon its wielder the ability to transform into a member of the Blue Dragonflight. Those who complete the staff won’t be the only ones to receive a reward, though. As this task requires the dedication of an entire guild, upon completion of the staff all guild members will receive a unique non-combat pet to call their own.

The staff is named after Tarecgosa, the blue dragon that gave her body to protect Kalecgos and to see the Blue dragonflight's new aspect debate come to an end. Her essence resides within the staff.

The body of the staff is actually a retrieved Branch of Nordrassil (quest item).

Mechanic
The spell duplication mechanic is unique to this staff and exhibits several interesting synergies with class mechanics.
 * There is no ICD.
 * The duplicated spell is independent of its source spell. The source spell may crit while the duplicate hits or vice versa.
 * If the staff duplicates a DoT-tick, the exact amount of damage is dealt by the spell 'Wrath of Tarecgosa' as arcane damage. This spell will not hit critically.
 * Duplicated spells behave as if you did cast them. They are subject to the same talents, buffs, debuffs and other conditions. They can also trigger other procs except the spell duplication from the staff itself.
 * An arcane mage's Arcane Blast will apply another stack of its debuff upon duplication.
 * A fire mage with Master of Elements will find, that a duplicated spell critical will refund mana even though it did not cost any mana.
 * A frost mage's Ice Lance will consume a second stack of Fingers of Frost, if one is present, upon duplication.
 * Certain proc spells (including items) can be duplicated, like the lightning bolt from the Variable Pulse Lightning Capacitor.
 * Duplicated spells are cast at the target which received the source spell that triggered the proc regardless of Line of Sight.
 * AoE spells like Flamestrike can be duplicated in which case the duplicated Flamestrike will be cast exactly at the position of the mob whose hit triggered the proc.
 * Channeled spells like Arcane Missiles will gain an additional tick when a duplication is triggered.

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