How to Defeat Ansur

This method can work even on a solo honor run reliably for stealth archer. All credit for the plan goes to Morgana Evelyn and check out her amazing fight and run with it.

Prepare with her stealth archer build and buy at least 3 Arrow of Dragon Slaying.

First make sure you have a misty step available, then try to loot him to make him spawn, go through the dialog, then misty step near the helmet grab it and go past and exit the room through the door.

To prepare - Cast Shield of Thralls, Pass Without Trace (or another concentration spell such as guidance, need concentration for Concentrated Blast), Oil of Accuracy, then Invisbility.

Go inside the door, fly up to him.

To get the surprise round, use Concentrated Blast.

Then get close enough for Aura of Murder affects him, use Arrow of Dragon Slaying. He reacts and can do 45+ lightning damage so make sure sure you have enough HP to withstand that. Then use a few more Arrows of Dragon Slaying until his corpse is lootable.