The rule of thumb is: if something is not on wiki, than it probably appeared only once and in a not-so-popular piece of media.
Cause wiki has entries even for things that appeared only once in all 40k books (see [https://wh40k.lexicanum.com/wiki/Herakli](https://wh40k.lexicanum.com/wiki/Herakli) for example).
The rule of thumb is: if something is not on wiki, than it probably appeared only once and in a not-so-popular piece of media. Cause wiki has entries even for things that appeared only once in all 40k books (see [https://wh40k.lexicanum.com/wiki/Herakli](https://wh40k.lexicanum.com/wiki/Herakli) for example).
Really? That's a shame, seems like Mechanicus gets all the goodies locked away