I was looking at items in the store and noticed that the armor for Alumon says it’ll damage Knolan if it procs. Either this is a bug, or Alumon just hates Knolan for some reason.
Afaik, it’s a known typo. They basically stole an effect from a Knolan only item and copy-pasted it to the Alumon piece of gear. It still damages the user, rather than Knolan, afaik, so it’s mainly a problem with the effect saying a specific character’s name (because it’s from a Knolan specific armor) rather than “the user” as it should.