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Exo-Toa are armoured suits that could be worn by the 2001 Toa Mata and the 2002 Toa Nuva. However, neither Pohatu figure will fit without total reconstruction, and slight modifications are needed for 8532 Onua to fit.
In the 2002 storyline, the Toa tried to use the suits to defeat the Bahrag, but took them off after they realized using them reduced their power. In 2003, The Exo-Toa (unpiloted) later made an effort to defeat the Bohrok-Kal, but failed and were destroyed.
Exo-Toa would later reappear (controlled by auto-pilot) among the ranks of the Brotherhood of Makuta's armies.