The reason I'm favoring a Hiryu for this over a CU right now for this build is because the cu has bleed and the hiryu has grasping claw. That being said I know healing is a huge benefit and it's difficult to ignore that. Also the hiryu has over capped wrestling and sometimes parry, and up to 90 fire resist which is also pretty nice.
I had a cu, you may remember my earlier post about it, that had discord and aura of nausea. I made the mistake of not saving the right amount of points for scrolls and a disco pet really needs 120 disco at the very least. I was going to remake him exactly the same, but save the right amount of TP for scrolls, just not sure about aura of nausea, that 100 mana cost hurts and also a bit in the dark about how effective it is because it's not something you can lore. Seemed to be pretty effective, but having no hard numbers on what it does drives me crazy. Then I was considering trying that same build (aura nausea and disco) on a reptalon because they have aura available without having to waste 100 TP on poison first, but they also have stinky dragon breath
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Basically trying to minimize the number of abilities the pet has so it can only use what I want it to.