Whatever might be the Mystery its pretty clear that Markat is the one scheming brain behind all this trouble for the Aadi-Naagin Bani.Also I saw the Markat promo.
Markat looked like some sort of Takshak-Naagin. As far as I am concerned within the Naagin Season 2 Takshak snakes were presented as Flying Snakes having wings on both side of the scales.So this proves that Markat might be from the Takshak Vansh & while Bani might be the Aadi-Naagin perhaps from the Shesh-Naag clan she's the ultimate head of all the clans whether its Takshak/Sheshnaag or any other snake clan.
Markat is not the Official God neither she's the Deity for Scavengers as the promo showed today.She's a Naagin after all successfully manipulating the predators for 10000 years right from Satyuga to Kaliyuga.This also explains her thirst for the powers of Veer or Bani since Bani is anyway powerful while Veer is yet to discover his true potential.
So Bani is gonna face more troubles good but don't come back to Veer for support.After all even if Veer protects her from Markat she will still continue her rants of taking Veer's life as usual.
Bani is an arrogant & airy-headed Naagin.