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The Rhynocs served as the Sorceress's main attack force, acting on her orders to terrorize the Forgotten Realms and enforce her rule. When Spyro came to reclaim the stolen Dragon Eggs, the Rhynocs were dispatched to dispose of him, with Bianca referring to them as their "expertly trained armies" when she tried to scare Spyro off. They are hostile enemies to Spyro in the majority of the realms within the Forgotten Worlds, with few of them being turned into monsters by Bianca and the Sorceress in attempts to destroy Spyro, only to end up destroyed themselves.
Spyro: Season of Ice
After the Sorceress's defeat, the Rhynocs discovered that they had no sole purpose, even when they served her. Many of them were left jobless or had to take less-than-ideal day jobs. They were soon employed by a large, manacial Rhynoc named Grendor, who then sent them to gather for him the 100 fairies he had frozen to give him more power and to fight off Spyro.
Spyro 2: Season of Flame and Spyro: Attack of the Rhynocs
After Grendor's defeat (and reformation), the Rhynocs once again felt unneeded and useless, until they were employed by Ripto. Ripto controlled the Rhynocs when not using his army of Riptocs during the events of the Season of Flame, and after stealing the Professor's Laboratory in Attack of the Rhynocs. Rhynocs have not been seen since.
Standard Rhynoc model in the Spyro Reignited Trilogy by Justin Bintz
Trivia
While pronouncing "Rhynocs," it sounds similar to the name of the Transformers: Beast Wars character, Rhinox.
The Rhynocs are the second species in the Spyro series to resemble Rhinos (the first being the Snail Rhinos).
In Spyro: Year of the Dragon, some of the Rhynocs' faces bear a strong resemblance to Ripto.
In Spyro Orange: The Cortex Conspiracy, the trading card of the Charging Rhynoc, showing the design of a Rhynoc that looks identical to a green-colored Riptoc from the same game. It is a mirrored version of the Charging Riptoc, who is also a teal-colored Riptoc.