Zoom through the Ember Caves to this area. The Vex are invading the Fallen; the primary focus here should be the Hydra because it’s by far the most lethal. Clear this area out then enter the Cinders.
Below you’ll find another battlefield between the Vex and Fallen. Start to thin their numbers with a ranged weapon then get in closer. Head down to the left and your Ghost will start to break open the hatch once you deploy it. Like normal, this takes some time and you’ll need to defeat the Vex that attack. The first wave is Goblins and Minotaurs, one is a Major. The second wave is Goblins and Major Hobgoblins and you will need to be careful about getting sniped here. Last, you have Harpies and two Major Hydras. It might be worth backing up the trail at this point to get a better angle on the Hydra.
Ahead you’ll find Pikes that you can use to ride through the Ash Coves. Use the weapons on the Pike to destroy the Vex. It makes taking down the Major Hydras at the end much simpler.
Askor, The Archon Priest
When you reach Winter’s Run you’ll need to eliminate the Vex and Fallen that are battling then release the Archon Priest. This battle requires the group to spread out and focus on the additional enemies that constantly spawn. Once the adds are taken down you should rotate around unleashing your heaviest shots to draw the attention of Askor but never allowing him to get a clean shot off. The hardest part starts when the Servitors and Stealth Vandals emerge because they can unexpectedly kill someone. Overall, Askor is one of the easier bosses but you just have to be mindful of the additional enemies that come from the gates.
Focus on his head for the most damage. Void weapons seem to do the most damage such as a powerful Fusion Rifle. Remember to keep hidden if the other Guardians fall and you cannot reach them; let them revive so you may continue the battle.