DO NOT turn in your letter to this guy while shrouded!! I had not read down this post (bonehead!) about him NOT being KOS anymore, so I went in my chanter evil eye shroud, expecting to need to charm him (wanted to try this instead of invis turnin, again, bonehead!). Well, handed him the letter, he took it and didnt say a thing! So I am currently waiting for my /petition to be responded to.....hope I get it back.
Diddugu's location is almost dead middle of the very TOP of the map, he is standing near to Jen Sapara, a dragon. He is by a cluster of crystals. He was indifferent to me so I needed no invis/sneak.
Just did my turn in on Stromm on my 70 bst. Was not Kos Before, after or during the hand in. Checked before doing the turn in.. clicked off invis and he was indifferent. I'm Warmly to CoV and Max KoS to Kromiff / Kromzek ect. So this mob is not on any of those factions, It's possible that he was changed from a patch from being KoS to indifferent.
Actually he cons indifferently if you have 0 faction adjustments. IE, if you haven't killed any giants, coldain, etc. He is Indifferently, if he scowls and you're on CoV faction. I'd guess he's on Giant faction. Or possibly on his own faction, like the True Spirit.