How to summon the boss.

Victus

During multiplayer flights, I've noticed players summoning the boss. How do I do that? I have obtained the boss via artifacts. Is there a way to summon him during the fights?

Blitz

No. You can't summon a boss, but it will appear when you are attacked in multi-player.

phenxrsng

how cause i have a boss and not seen it happen is it a random chance or like do you have to set it up cause i have not been able to have my boss show up even though i gotten one even when im trying to defend or i even seen some when they attack they bring their boss with them and i cant seem to do that either please help