The Spellbinder (エグザミネイション Eguzamineishon?, lit. "Examination") is a Keychain for Sora's Keyblade which appears in Kingdom Hearts, Kingdom Hearts Final Mix, Kingdom Hearts: Chain of Memories, and Kingdom Hearts Re:Chain of Memories.
In Kingdom Hearts, after obtaining each of the seven spells, Sora brags that his magic is as good as Donald's, and Goofy suggests that he talks to Merlin. Merlin rewards Sora's progress with the Spellbinder.
In Kingdom Hearts: Chain of Memories and Kingdom Hearts Re:Chain of Memories, the Spellbinder is the signature Attack Card for 100 Acre Wood, but must be obtained as a reward before it will appear randomly. In Kingdom Hearts: Chain of Memories, Owl gives Sora the Spellbinder once he is found, and in Kingdom Hearts Re:Chain of Memories, it is found in a chest at Tigger's Playground.
The Spellbinder Keyblade takes its theme from the imagery of magic and astrology. The handle is dark blue and the guard encircles the handle like a white, squat teardrop where the top of the guard is a white heart. There are two dark blue arches with a hole in the center of each, one on each side of the top of the guard. The shaft consists of two separate blue poles that end at the "teeth" that resembles half of a gear.
There's a dark blue circle, surrounded by a light blue, then another dark blue circle around that which is the inside of the teeth piece; this group of circles is attached to the shaft by another light blue arc. The outer side of the circles is a half circle with a point at the peak and two small spheres within the half circle, one by the peak and one in the center of the arc. The top of the shaft is a dark blue, six-pointed star within a light blue circle. Its Keychain token has a gold karabiner with a rusty chain attached and a green spellbook as the charm.
The former part of this Keyblade's name may reference the fact that it powers up your magic since a spell is derived from magic. The latter part may reference the fact that you obtain this Keyblade only when you have all 7 spells with you which means you must "bind" all the spells into you before you can obtain this weapon. The name also could reference to the fact that it binds your magic all together making it more powerful.