Commander Niall is the boss at the end of
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At the beginning of the fight, Niall will summon two phantom Banished Knights. All throughout his first phase, he sticks mostly to close range melee attacks, so the hardest part is really crowd control. It really helps to summon a tanky spirit ash such as your own Banished Knight or Mimic Tear to keep some of the aggro off of you. Keep your distance until you can separate one of the phantoms from the group, focusing on taking down one summon at a time.
After the ghosts are gone, whittle down Niall's health by dodging his combos and getting in hits when you can. At around half health, he'll transition to phase two. At this point, ha adds several AoE spells to his arsenal that deal a ton of frost or lightning damage. Almost everything would two shot me during this phase, so you really want to keep a large distance between you and him for most of this phase to avoid the worst attacks. At range, he has two moves to worry about:
- Let's call the first "Frost Tornado Lightning Slam". He starts with a spinning frost attack and then you'll see a spark and he jumps with a lightning infused leg, hangs in mid air for a second and slams down on you. This closes the gap between you no matter where you are, so you need to dodge at the last possible second. He usually follows this up with one additional spear thrust. You can get a quick hit in if you dodge the second attack towards him. Get away again as fast a possible.
- The second is a quicker spear lunge that also takes him across the arena to wherever you are. Again, try and dodge at the last possible second.
You can wait for counter attack windows and defeat him with melee armaments, but the easiest way I found to deal with his second phase was to dodge those two attacks, run away and hit him with spells at range. There was plenty of time to get off a hit or two while he was just kind of standing across the arena from me. Just don't get too greedy because if you're in the middle of an attack when he jumps at you, you're probably dead.