Power Soulbeast is bursty power build that also carries a fair amount of CC. This build requires solid muscle memory as many of the skills can be easily cancelled. This build can take Dagger for better sustained DPS or Sword for slightly better burst DPS.
Power Soulbeast is somewhat beginner friendly and becomes more effective the more knowledgeable you become. Mastery of this build will take some serious muscle memory and dedication.
You can open with when on the golem, but in an actual raid scenario you will want to delay it until you swap to your Sword set.
Dagger and Sword both perfectly usable for this build. Dagger offers slightly better sustained DPS and Sword offers slightly better burst DPS.