Spellstone

Common, Trinket, item level 36, item 5522

Changed from Classic: the tooltip differs on the highlighted lines below.

Spellstone

Binds when picked up

Unique

Use: Imbues your weapon with Shadow, increasing your spell haste by 1% and the damage done by your Shadow spells by up to 14.

Changed from Classic (see below).

Classic's version

Binds when picked up

Unique

Held In Off-hand

Requires Level 31

Use: Removes all magic effects from the caster and will absorb 400 magic damage for 1 min.

Equip: Improves your chance to get a critical strike with spells by 1%.