Craven Corinth

Took me a few tries, but here's what worked for me:

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• Use Pelagos as your champion. Use his (3) ability whenever it's off cooldown, and move into the rightmost "clone", which gives you ~8 seconds of invulnerability. It's full invulnerability, not an absorption shield - so while it's up, you don't need to worry about taking damage.
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• I didn't clock it, but it seems that Corinth uses his abilities after taking a certain amount of damage, rather than on a set timer. Use this in conjunction with your invulnerability shield - while your shield is up, don't worry about keeping your distance, just focus on nuking him down as fast as possible so he stops attacking and switches to one of his channeled abilities. (Keep in mind that you can auto-attack while moving, so if you're waiting on cooldowns, feel free to run away.)
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• When he zips away to one of the corners and starts channeling Consume, you need to kill the anima orb as fast as you can to stop him from healing. Once you figure out where the orb is located, you can use Pelagos' (2) ability to damage the orb without having line-of-sight to it and using Herald's Footpads can help you get there quickly to finish it off. (Consume is not interruptible by the Deep Echo Trident.)
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• When he moves to the center of the arena and channels his AoE "fan", move in as close as you can get while still staying between the damage "blades." This will give you time to move into the safe zone when he starts the third cast. Once you're in the safe zone, get as much distance from him as you can, to buy yourself a quick respite from damage while he moves back into melee range after channeling.
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Good luck!

I have these mats. Why won't it let me select Continue for the quest?
EDIT - So I ended up crafting another Soul Mirror and now it'll let me Continue on the quest.

For Craven I chose Pelagos again as he feels the strongest.

Craven is a melee attacking mob that will chase you around the arena. He will chase you for roughly 10 seconds before he teleports to the middle of the arena and casts.

At the start of Craven's chase phase always trap him using Pelago's second ability Aspirant's Bindings. This gives you enough time to get a Test of Faith off for free. After you get your full cast off he will start to chase you. When he is chasing you around the arena use Pelago's third ability (Confront Memories) and choose the right spell to gain Armored Recollection. For the next 5 seconds you will be immune to damage. During this time get another Test of Faith off. I found it easier to keep Craven near the center of the arena to prepare for his cast phase.

For his cast phase, Craven will cast 3 sets of aoe's. The first two casts are giant crosses much like Dark Inquisitor Xanesh from Ny'alotha. Stand as close to Craven as possible without standing on the dark part of the X. If you stand on the dark part of the X you will take roughly 75% of your health as damage and you basically wipe the fight from there. If you can weave in a Test of Faith during the casts feel free, but cancel the cast if Craven is about to hit you. For the third cast, Craven will change from the X pattern to a huge area affecting roughly 60% of the map. This is a good time to use Herald's Footpads if you have them to dash behind Craven. If you dont, then just quickly run to the safe part of the arena.

After the casting phase you will fight Craven for a few seconds before he teleports away. He will teleport behind one of the four pillars of the arena and begin to devour an anima healing in the process. When he does this I choose to use Pelagos' fourth ability (Unleash) to hit both Craven and the anima behind the pillar. After the anima is dead Craven will chase then enter the chase phase again.

From start to finish he will get roughly 2-3 casting phases off based on how the encounter is played out.

Overall, it is an easy encounter as long as you prioritize not taking damage over bursting Craven.