Tim

Tim is a rare enemy found in the lower Cavern layer. With an appearance similar to Dark Casters, he can be distinguished by his Wizard Hat, which is guaranteed to drop when he is defeated. Like other casters, Tim will fire three Chaos Balls that pass through solid blocks before teleporting to another visible location on screen.

On the, wearing one of the Gem Robe variants without a Wizard Hat will quadruple his spawn rate.

Trivia

 * Tim appears to be wearing a robe and a wizard hat, Tim will always drop the wizard hat, never the robe.
 * Tim's spawn rate increase is described in changelogs as occurring if the player "need[s] his hat". This increase is actually triggered by wearing one of the gem-crafted variations of Robes – any of which can serve as half of a two-piece Wizard armor set with the Wizard Hat that Tim drops, granting the player a 10% increase in magic critical strike chance.
 * Tim's name is a reference to Tim the Enchanter from the British comedy film , as confirmed by former Re-Logic employee Blue on the Terraria IRC. The name of the achievement gotten by killing him is also a reference to his introduction in the movie.
 * According to the Bestiary, Tim is Rune Wizard's younger brother.

History
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