821b10b7__Original_RuneScape_Help_Site___Strategy
[Brother] Guthan the Infested [Prayer or Curse] None [Attack Style] Slayer dart [Strategy] 
Use Slayer dart and he should die pretty quickly, unless he gets some lucky healing hits on you.
Barrows Guide - Pages :: Tip.It RuneScape Help :: The Original RuneScape Help Site!
Strategy