mobs that should be invisible/not-see-name

[nilbog]

I had issues with invisible npcs using bodytype 66. From my experience they will aggro players who unknowingly cast AEs around them, etc.

I have found the best combination of invisible perl npcs to be race 127, bodytype 11, with their npc_types name the same as their npcid.

example. NPCID: 905000

name = 905000
127 makes them invisible
11 makes them untargetable

So you're left with a completely invisible, untargetable npc.