Where is Sassan ?

Hello,

After maybe 150+ map running with workers i still don't encounter Sassan. (100 map from tier 14+ with alchy)

Which make me wondering if the boss is bug or something ?
Because right now i already encounter the others 2 boss 5 times already :/

You have to have your map runners running maps for him to interfere.

Quick update, After finishing the challenge " Claim rewards from rare, Tier 14 or higher Maps successfully completed by your atlas Runners " which is 200 map btw.

I didn't encounter a single time Sassan...