Talk:Stalker/@comment-25713367-20141025150042/@comment-1763304-20150225141758

Level 40 is the level you first see these on singleplayer. You can see them as early as level 10 on multiplayer, however.

I'll explain it here - take the first apperance levels on each of the articles as their singleplayer apperance (unless it says otherwise, such as with savage devastators and necrosis). Expect it to be at least 20 levels earlier if you're on multiplayer.