Just found the 3 tomes, got the rift specialization and tried out your tactics above.
Can’t say I fully understand all the detonations stuff yet but the enemies are now going up in smoke faster than my team can get a look in!! I’m getting all the XP, they’re getting none. Even the boss fights are a walkover, the last boss I whacked was getting clobbered so fast he hardly had time to get off the ground.
I guess all the best players are on this website sussing this stuff out eh…..
Since my last post here I started a new nightmare playthrough as a mage and (you guessed it) chose Rift.
I still use the combo above, but have replaced Chain Lightning with Static Cage+. I was able to do so at level 15 with all the required passives/abilities from Rift, Inferno, 2 points in Spirit and Fade Step. My hotbar currently looks like this:
1. Energy Barrage
2. Immolate
3. Fade Step
4. Stone Fist+
5. Barrier
6. Pull of the Abyss+
7. Static Cage+
8. Mark of the Rift
With the passives in inferno you can sometimes have 2-3 (and rarely 4) Static Cages up just by yourself. And yes, they ALL stack (Barrage lolz). Plus the paralyze and ****. Add in 10% chance to cast Walking Bomb on hit and whatever else you like from gear. It makes Storm of the Century (DA:O) look like a cup of noodles.
I'm currently working my way towards Fire Mine to replace Immolate and then probably finish off with passives/spell upgrades.
If that's not enough for you, spec Cassandra as a 2-hander and use her to detonate combos, as the damage seems to scale based on the character's weapon. I've seen her hit for 8k spirit damage (aoe) with her Dispel finisher, using a 250~ dps greatsword.