How to summon phantoms (Dark Souls 3)

Corn27
You must be in a smoldering form (use coal). Then at the doorstep to the boss there will be call signs.

Marty52
I don't go to bosses without coal)). And still I don't see anything. For example, I've already tried to kill a dancer 30 times, half of them with coal, and there is nothing in front of her. Maybe because of the pirate?

Kukuruza27
Maybe because of the pirate?
And who are you trying to find then? NPC? They are not called to this battle.

Marty52
It's just that with the boss, the guardian of the abyss turned out to summon someone, so I thought you could summon NPCs on all bosses

how can I like this topic, so that they would laugh later when I'm sad ?! XD