Talk:Codex/@comment-59.152.237.106-20161012044659/@comment-26043655-20161012050545

Most of those entries are very difficult to record and largely are not put in the Codex. With Objects, it was easier to record.

All Hives are listed. Some enemies like the Old Stalker; you had your chance. You will have to find others like that. Otherwise, you had many chances for 3 Scans.

Chroma or Infested Mesa are debated on. Generally, enemies like the Arcane Boiler or Big Juggernaut will only appear once or twice but will require more scans. What I do is sometimes repeat them just to get scans, while you can also accompany people in some quests. (An exception in Sands of Inaros you cannot as you must both have the pots).