Best party for me was :
Inquisitor : Rift Mage
Prefered : Dispel, Revival, Barrier
Enabled : Chain Lightning, Stonefist
Role : Crowd Control and Barrier mage (Will put enemies to sleep and detonate them into nightmare)
Special : When Barrier breaks with 2 points in the frost tree, it does an Aoe Frost Nova
Cassandra-Shield Bash or you Mages-Stone Fist will detonate that. Also, dispel could cause a small detonation.
Solas : Rift Mage
Prefered : Dispel, Revival, Barrier
Enabled : Chain Lightning, Stonefist
Role : Crowd Control and Barrier mage (Will put enemies to sleep and detonate them into nightmare)
Special : When Barrier breaks with 2 points in the frost tree, it does an Aoe Frost Nova
Cassandra-Shield Bash or you Mages-Stone Fist will detonate that. Also, dispel could cause a small detonation.
Cassandra : Templar
Prefered : Charging Bull, Spell Purge
Enabled : Shield Bash, Shield Wall, Grappling Chain, War Horn
Role : Will completly destroy Guard and Barriers, will crit on those for 5k+ ... Also, decent crowd control
Blackwall : Champion
Prefered : Charging Bull, Pommel Strike, Walking Fortress
Enabled : Mighty Blow, Counterstrike, Grappling Chain
Role : Each Pummel Strike will be followed by a Dispel Combo (causing weakness), then Chain Lightning (causing sleep), then Dispel again (causing nightmare).
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*) First and most important, the AI described above will play smart, you can control any of those characters, but I usually control Blackwall. It is always fun to witness the AI detonate dispels left and right. The AI is actually better than me at doing so.
a) Warriors can open locked doors with shield bash or mighty blow. No need for a rogue. You can always fast travel back for those "deft hands" locked doors.
Shocked (chain lightning) + Weakness (Stone Fist) = Deep Sleep. With dispel on prefered, you will see combos flying left and right and very decent damage.
c) Set every single party member to use 0 potions, except for Cassandra. They will use their barrier or invulnerability skills to survive fatal hits and if all else fails, you have double revive. Seriously, the strength of this party is its surviability even when you have 0 potions left.
d) For Dragons, just disable Chain Lightning and Enable Energy Barrage. Then, equip a staff with an energy to which the dragon is vulnerable. Cassandra will melt through guard.
e) Fun factor. I fell like controlling a tempest rogue sometimes feels like cheating. You burst so much damage, you feel like you dont even need your team. In other words, the main reason why I like this setup is because my team supports each other and combo off each other's abilities. It really feels like teamwork.