Erabus is an unused creature from the unmade movie Godzilla Vs. Redmoon. This movie would reuse and modify the suits from Daigoro Vs. Goliath.
Erabus, whose suit seemed to come from Daigoro's mother, was the mother of a creature called Hafun, and the mate of the film's titualr entity, Redmoon. The script seemed to call for Godzilla attacking both Redmoon and Erabus.
Source
Template:Unmade