I found a zero-reply thread from 8 months ago ( link ) asking for this and thought I should make an argument for why this would be useful for me. I am following the Angry DM advice on creating a DnD 4e boss ( link ) which changes the way monsters become bloodied in 4e. It would be nice to modify my current bloodied/dead API script to check for the tag "boss" and treat them differently than all other NPCs. I can replicate that now by setting an attribute on the character sheet, but tags seem a great way to handle this. Any thoughts?