So it's more like kill a queen bee and workers bee will die on its own.

Brun them I guess?

I never appreciated to or think this way but Kai might be the best support all-rounder he buffs, heal, make weak or stun and also do off-dps.Also for far distances (this might be hard to understand for all the people who never play games)

So sunny become fateless and everyone loses his memory 

and sayer kill the daemon of fate and loss her memory? This the price right?

This chapter was way too short also Kai my buddy, you have delivered the final strike on white dargon you are the dargon sayer.

And just imagine Kai stealing that the final blow (kill), just image sunny face.

I the first part joke like sunny first thought is I need both have to cook for my future wife.

But because of that middle paragraph I think. If  if somethings bad happens to Kai i am gonna cry.

So it's something related to demon name maybe it can control or something and sayer is holding Kai and sunny that why they are immobilized.

May it has the power of true darkness like that girl (I forgot the name, saint get her new darkness domain or something like that from that girl during the war).

Well idk much about it, but they have power same as awakened but by using position instead of awakening. If you remember first few chapters they tell about different positions and there powers.