So I'll admit, I had never watched GoT until last summer and watched ALL OF Seasons 1-6 in the previous summer (2016) LOL, so maybe I missed something here and there in the rush.
But does the Night King have similar powers to Bran?
Because the Night King didn't seem surprised to see the dragons there (as if he knew they were going to come), and then during the battle, just readied his spear and ultimately got the dragon he wanted. Was that his grand plan all along? How would he have just known the dragons were coming?
His full powers are not detailed. We can only assume things beyond what we have seen.
What we seen- He wargs dead things on an immense scale.
-He is immune to some fires (wild fire unknown).
-Dragon glass disrupts his control over his thralls.
-Can manipulate ice.
-Can see green dreamers /wargs while they use their power.
-Can ice mark and ice turn people (Bran mark, Craster boys).
-Very strong physically.
We can maybe assume that if the Night King can warg at a massive level then he is likely a green seer. I suggest this based on Bran's big feats at warging is beyond most wargs and Bran happens to also be a green seer.