Lucian would attempt to try and cripple the beast with his Chained Mana Surge, although with how little damage it did before it probably wouldn't work, but still it was a nice way to get its attention off Ren cause currently that was where it was going to take its attention. 

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Lucian Chained Mana Surge: 4 (Critical!)

Critical Hit!

Damage Dealt (Main Surge): 35

Damage Dealt (Minor Surges): 22
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The attack seemed to be a more powerful attack than normal, but was not a Critical Strike not in the conventional sense. Lucian managed to launch it with alot more power than it usually had, and even striking its knee in the way he wanted, but no Critical Strike alert appeared as it didn't really have weak points due to being a giant dead corpse. Still the creature was standing up and when the more powerful Skill hit the creature roared out as the explosion from the total power of all three more powerful surges managed to bring it down to one knee, making it glare to Lucian and slow it down. 

Unfortunately this meant it had to try and get up. It wasn't crippled, but indeed slowed down for a bit and its attention was now turned towards Lucian, still trying to get the flames off of its body that were actually damaging it, a 10 appearing over its head making it roar. This meant Ren, from behind, had plenty of time to attack, launching another Eldritch Flame empowered Spinning Mana Blades. Before he did though he answered Lucian's question with a "Save your MP, that actually did something, and even if that doesn't work again it distracts it." He then launched his attack, saying the command words needed to send the fiery mana buzzsaws towards the creature. 

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Ren Blade 1: 23 - 30 Projectile = -7
Ren Blade 2: 42 - 30 = 12
Ren Blade 3: 68 - 30 = 38

Hit (All deal Max Damage)

Damage Dealt: 213 Total
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All three blades slashed deep into the beast, making it cry out loudly in pain once again and roar in rage as it was still standing up in those moments despite being sliced deeply it would suddenly, instead of standing up to attack now, begin to suddenly open its mouth, dead spirits seeming to appear and fly into it, slowly beginning to regenerate some of its health, Lucian and Mike still having time to act during this. 

"Damn its regenerating, try and keep its attention during all of this and ill try and finish it off with Giga Spiral Bolt." With that Ren began to get into position while the others acted.