My only experience with the Tangrin on p1999 has been making a newb lvl 1 iksar monk and swimming to the island - he agro'd me way before i got to it and killed me before i even got to see him hehe, i just was tryin to say hi
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So not sure if this helps ya any, but yeah he definitely has a huge radius and will come out and kill you in the water so beware everywhere who goes near the isle of the tangrin