>>9269666It was a metal eating one.
The Shadowed One made the debut of its effects when he killed Ancient in Xia with the contents of a container carrying it. It was a metal eating component that devoured Ancient before he could act on killing/turning on him as he was also a member of the order of Mata Nui.
Then with other viruses, they do have certain ones that work as simply vague or estranged as dust or powder ones as with how Takanuva got to the big size and power display when Krika used it on him in the other dimension.