This a monster you definitely want to build first.
So before we begin I must say that this is an idealistic look at Argen Rune set. Getting these exact substats is pretty hard and is something you should just strive for with time. Also the positions of the runes can be changed as long as the main stat matches and the set is Rage/Blade.
For Argen you should be looking to pump him full of Atk% and CD%. You should aim for CR around 85-90%~ because after 80% it doesn't really matter as the during battle the formula doesn't really allow 100% CR realistically. The hp% and atkspd can be interchanged up to you but you just have to make sure your Argen lives and hits enough to stack his thirst.
Reasoning for this type of rune set is because Argen is primarily a PVE unit, You can use him in PVP but where he shines is PVE. During Field Bosses, Raids and Guild Raids normally there will be tons of Debuffs. This is important because Argens 3rd skill scales of the amount of debuffs making him a terrifying force in terms of damage.
Hope this helps any new player :D
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