A colossus lost sector boss people for damage testing because he’s really easy to get to (even though damage testing on him is kind of bad as he counts as a major and not a boss. meaning any differences to how weapons deal damage to majors vs bosses will effect damage testing if not taken into account. Unfortunately 99% of YouTubers don’t so misinformation tends to spread a lot about specifics in damage)

Colossus at the end of the lost sector in the cistern on Nessus