
Credit for actual build:
Well, not me but who knows who created it. I got this off the Warrior build directory, with Zero7511's build for soloing Rhea;s Crater. I have extended this to farming all of the Outcast race

Anyway, lets get on with the build.
Attributes
Air Magic 4
Strength 10 (+1)
Sword Mastery 9
Tactics 11 (+4)
Skill Bar
Sprint (could replace with Ripost but dont really need to)
Deadly ripost
Gladiators Defence {E}
Bonetti's Defence
Healing Signet (use only under bonettis)
Dolyak signet
"On your Knees"
Whirlwind or tenai's wind
Weapon : Sskai's sword for the furious bonus to adrenaline.(need for "On your Knees" and Bonetti's Defence)
Shield: any shield with -2 in stance.
Armor: any armor will work. I use Glads, with ascalon Helmet for Damg reduction.
Runes: Sup. Tacts, Sup Absorb, Sup Vigor, Minor strength
Procedure: Start in the Sunspear Sanctuary, go to the Command post. Turn right follow the sign saying Arkjok wards (i think thats the name, doing this from memory). Once outside follow the river to the lake you will see him directly across the lake. Proceed to kill him.
Now that we know where he is, I am actually not going to tell you how to kill him. Reasons, well, I think that you should be able to figure that out by yourself. I enjoy the problem (puzzle) solving aspects of this game and dont want to spoil that for you. I will provide some clues though to help you figure out how to kill him. Also, if you have Glad's Def. you have been through the Dragons Lair in Prophecies and hopefully are experienced in this game. So, me telling you how to use it is a waste of my time.
Problems: 1) Aggroing Onwan and his group without annoying all of the birds and plants around him.
2) Not getting killed by his group. A bunch of rock throwing Gorilla's.
3) Kill Onwan
Hints: 1) If you cant solve a problem by the Direct method, than Step back and look at the problem from Another Angle.
2) Use the Terrain to help you. If you do this correctly it becomes a 100% effective shield against all the Rocks that those Gorrila's throw at you.
Infact, this trick is nicely explained on the War. thread "The Art of Tanking" if you havn't read it, do so before trying this out. It will change the way you play this game.
3) Killing Onwan is simple, when you have solved the above two problems. He literally lasts seconds. I usually kill him by the end of the second Glad's Def. So lets go Rhino hunting (yes this works on the regular Rhino's)
Oh, I've thought of another problem. I havn't been able to get his shield yet. Which is obviously Max but provides a bonus against Poison. Ive killed him at least 10 times, last 5 times in a row without dieing. In fact I dont even get to half health. I'll post a pic when I get one.