Try with area effect arrows. You can buy them at the fletcher's shop in Vivec, Foregn quarter (you must have the official bethesda fletcher mod). Lucky or mighty as he might be, I don't think he can escape splashing damage.
And while you are buying the arrows, steal the daedric longbow you find in the same shop. That will greatly help as well.
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Never attribute to malice that which can be ascribed to sheer stupidity
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