What unit Type is Mirror Image?

Hey, I was wondering what unit type the game assigns to the Blade Master's Mirror Image?

(By unit type, i mean Summoned, Hero, Building, etc)

It doesnt seem to respond to any of the triggers in which they act with summons.
emote_sweat

Thanks!

They're classified as illlusions lol.. I think. I don't think you can select illusion from any list though.

Events:
A unit enters playable map area

Conditions
triggering Unit is an illusion equal to true
Unit type of (triggering unit) equal to Blademaster

Actions:

Show text message for all players saying : ( wow!)

I see, thank you both!