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Arnold Ayala is a 3D artist who worked on Halo 3. He is a character modeler who modeled at least one type of Unggoy, one type of Kig-Yar, one type of Marine and multiple Flood forms, as displayed on his online portfolio.  Before working at Bungie he worked on other projects including Crystal Dynamics' Soul Reaver (with which he was involved heavily) and Stormfront Studios' Demon Stone. He later went on to work on 2k Games' Bioshock 2.