Zeradar

Zeradar is the in-game companion acquired by purchasing StarCraft II: Legacy of the Void Collector's Edition.

Source
This item is rewarded for purchasing the ' or the '.

Pet Journal
''Infamous psionic battering ram of the Protoss, Zeradar is also the only archon that can utilize psionic storm. Power overwhelming!''

Description
Players are mailed this pet by Breanni:

Trivia

 * This is an to StarCraft II. The name "Zeradar" is a combination of  and.
 * Grunty will shoot Zeradar.