Apologies if this has been posted before...
Rupture Soul (Spawning Power)
Target allied Spirit is destroyed. All nearby enemies are struck for 50..122 lightning damage and become blinded for 3..10 seconds.
Energy:10 Cast:0.75 Recharge:5
At 16 spawning power this hits for 146 damage on all nearby creatures. Get 2 ritualists together, create 4 different spirits, throw on arcane echo, lure the monsters close and Rupture Soul all your spirits. Bang. 584 damage in about 2 seconds. Much faster setup than a pair of trappers, and melee monsters are blinded after the first hit.
It's lightning damage, so some monsters may be resistant. It also doesn't work against some casters or ranged monsters, who can destroy the spirits without coming within range of the Rupture area of effect.
Damage can be buffed for high-armor monsters using Cruel Was Daoshen:
Hold Daoshen's ashes for up to 15..51 seconds. When you drop his ashes, all nearby foes are struck for 10..94 lightning damage.
Energy:15 Cast:2 Recharge:45
There are also several ways of getting spirits close to ranged monsters - Anguished Was Lingwah, Soul Twisting, and Draw Spirit all come to mind. I'll experiment with these techniques a bit first. However, plain Summon/Rupture should be perfectly fine for farming Aatxes and Smite Crawlers.