Since my main is a TW/Fire brute i thought id chime in. My damage output is extreem against all enemy types. I solo all content at +4*8 and the average mob lasts 10 seconds.
I have 2 seperate attack chains
Crushing blow and rend are my single targets, both have a recharge fast enough that they can go continually.
Follow through isnt worth the slot.
Titan sweep and arc of deatruction are my AoE gotos, bear in mind the PBAoE needs one of them to generate momentum.
Recharge has buildup firing every 20 seconds, usually triggering an additional chance for buildup. Fiery embrace is up most of the time giving additional power, healing flames is up every 10 seconds giving 740hp continually.
Cardiac incarnate lets you run longer and take harder hits with endurance reduction and resistance. Reactive interface for added damage and -res. Assault hybrid for chance to deal almost double damage.
Ive easily taken out all the AVs ive encountered solo, diabolique took the longest as she kept phasing and healing!
Ive also solod the giant monsters, Jurasika, scrapyard, kracken, adamaster and jack in irons, the rest are pn the bucket list!
The comicon fire farm on that floating island takes 3:40 to clear on +4*8 with bosses without trying to eat reds constantly.
Mu mastery epic is used as a debuff, by slotting 5 annihilation. This gives good sets and a chance for -res. Crushing blow and rend both have Achilles heel for more -res, the PBAoE has forced feedback keeping everything up.
Once you start fighting you dont notice the long animations as when you use buildup and compete an attack chain, you fire the epics, everything is dead and by the time you run to the next mob build up is on again.
I think TW/fire is far more powerful then spines/fire, its just not a passive combo. But then again we make characters to play, not to have as screensavers haha