Blademaster- What is Mirage Form?

I’ve been doing Monoliths with my Blademaster and decided to mess around with skills and try some things out (this game allows you to do that well) and I noticed in the Lethal Mirage skill tree to the left under “Phantasmal Presence” it states,
“When Lethal Mirage ends you gain Mirage Form for 1 second per critical strike landed. This can stack up to 6 seconds.”

Does anybody know what Mirage Form is? Their is no explanation or “alt for more info” on this.

Cheers!

Its bugged and doesnt work sadly.

I don’t know, I never tested it. But if that’s the case, good to know.