Batari's Temple
Go to the map marker to meet the Wenja you rescued in the previous mission.
Speak to them to make them help you breach the gates into Batari's temple.
Hold off the Izila as your Wenja attempt to crash the standing stone into the gate.
After a few seconds of holding backt he Izila, your Wenja team manage to push the standing stones into the gate, crashing the gates. Here, you also put on the Mask of Krati.
While wearing the Mask of Krati, all the Izila will flee from you in fear and are technically free kills since they can be taken down even if they are aware of your presence.
Just keep going to the map marker and you will encounter Batari. She is definitely not pleased with you wearing the mask and wrestles you and breaks the mask. She soon runs off and your fight with her begins.
Batari can be found at the very back of this stage. Using your owl, scout the region and go to Batari's area and use fire bombs to destroy the structures around her to destroy her hiding place.
Aside from Batari, she also calls on a lot of Izila to join in on the fight. Dispose of them however you wish.
After the normal enemies have been dealt with, a bunch of armored heavies will come in.
During or after dealing with the other enemies (preferably after) go ahead and attack Batari.
During your fight, she will call on the Izila a few more times. Just do what you have previously done and eliminate her reinforcements and continue attacking her. When she has gone down to almost no HP, she will head out of her area. When she is in the lower area, she can be defeated now.
Batari is now in your hands now as your burn her in their own fire.
After Izila is dead, the Izila are now without a leader, you return to your village and tell them the good news of Batari's demise.