Get Raging Strikes from Archer. Get Thunder from Thaumaturge. You can go by with that but later on you want to get Thaumaturge to 26 for swiftcast (will be useful for instant raise for party member who died from lack of awareness, or instant summon if needed, or instant tri-disaster in case). I can also see Quelling Strikes useful from Archer since I always get agro on Fates from Cyclops or Shiva or any NM. I believe tanks are not trying to keep agro on those Fates and since I outdamage all class, I repeat I outdamage all class, I became tank on those and it's annoying to tank when I am not tank. But most of the time, my Titan will try to grab hate. If I stop casting then my titan will get hate back. But if I keep attacking, I don't lose hate. You ask why I say I outdame all class? Simply because I am the highest in threat meter out of 20-30 people doing Fate with me and you get in threat meter due to your damage or healing. Since I don't have the need to heal then it's due to my constant DoTs and Fester.
For rotation, read post# 44-49 from this thread.