Boeroer mentioned a while back that Blood Thirst can be used on Barbarians to cast spells with zero recovery when they get a kill. With the new soulbound Belt of the Royal Cannoneer you get a pretty sweet spell-binding in Torrent of Flame that could be used for this purpose.
In addition to Torrent of Flame, Belt of the Royal Cannoneer also activates Flame Shield once per encounter on crit (perfect for a Barb with their sucky Deflection, and pairing nicely with Barbaric Retaliation, regular Retaliation and Battle-Forged) while offering great stat boosts for a Barb (+3 Might, +3 Dex, +2 Int) and giving you the option of Firebrand which is pretty lethal with Carnage (and can now be used with Gauntlets of Swift Action, unlike before where you had to use the Forgemaster's Fingers for it). The belt is super easy to upgrade (take 100 ranged damage, then take 200 melee damage, then deal 500 fire damage), I've been using it casually on my current Barb and it's really good.
On top of the belt, you can throw in either in either Amulet of the Summer Solstice or Sun-Touched Mail of Hyran Rath as Boeroer mentioned and have 3-6 Sunbeams too (though no slot for regular Retaliation if you use both and are a Fire Godlike). For a tricky encounter, you now have a situation where you can chuck out a Sunbeam to damage and blind the enemy, summon Firebrand, Dragon Leap into the middle of them, use Heart of Fury, use Barbarian Blows (remembering that Firebrand has Annihilation, so the existing blindness coupled with hit to crit conversion of Blows is great here), then use Torrent of Flame, then chuck out some more Sunbeams to the edges of the mob (avoiding yourself and you can blind yourself with it), and then keep at them with Firebrand or start spamming spell scrolls. At every stage of this when you get a kill, Blood Thirst means you do the next attack almost instantly, and of course you'll be putting out Barb Retaliation and Flame Shield damage with possibly Battle-Forged and regular Retaliation too.
This is personally would be my pick for a battlemage sort of archetype, given that the casting is so damn fast and your main weapon fits the bill by being magically summoned.
Edited by Jojobobo, 23 November 2017 - 08:36 AM.