Shaman - Enhancement shamans are beaten with evasion and elemental shamans are beaten with COS. Remember to COS either as soon as stun lock breaks to deny the shock or COS near the end of shock cool down to buy RS gold. I am sure everyone experienced the earth shield shaman ugliness. A top geared earth shield shaman I fought can heal himself for 655 every 3 seconds (crits for 989), simply by you hitting him about cheap runescape gold.
He also heals 10% of his total health every 5 seconds when you get him below 30%. It gets really ugly. Wound poison seems to do nothing against Earth Shield. Deadly poison takes away your blind bandage as well. I settled on mind numbing mainland, cripple offhand for this fight. Premed CS rupture GS hemo, then COS his incoming shock about cheap runescape gold, just white attack him for 5 seconds since you are immune to snares, then do a 2-3 point kidney shot.
With two COS two sprint and two vanish, it is much harder for him to kite me, mind numbing poison needs to be constantly re-applied against poison totem cleansing, so you can kick his heals to buy RS gold. Do not forget to evasion his melee attacks since every single bit of health counts in a long fight. I use heroism + renataki. A rogue with heroism + 2T3 (or 8BF), possibly dual lifesteal, and hopefully very high unbuffed stats should be able to defeat even the best geared shamans. Their DPS is low especially when you can eat two of their shocks with COS, every bit of healing you do for yourself counts. Refer to this article here as I did a quick clip on this fight to buy RS gold.