Well, looks like another one popped up. Contrary to the name, the boss is Thunder-based. A few electric mobs here and there, with a Wind and Water unit following them up, but mainly electric, so bring wind. I'm not seeing any new units as part of the rewards this time. Instead, there's a boatload of goodies, from equipment to special gacha tickets (but I don't see any gacha machine to go with it ), along with another chance to obtain Ruka via 500k Valor Points.
With Lv.70-80, enough bulk, wind and double heals, I'm able to Auto-Recover run (Bottom of the Hole to the Abyss) #2 comfortably. Not much a difference in valor points between #1-2, but it picks up at #3 by about 25%. I don't plan to go any higher, but from previous events, it may be safe to say that valor point efficiency won't get much/any better.
Most the mobs are pushovers, but (Bottom of the Hole to the Abyss) #3 starts to get dangerous; Water unit Lara not only acts like a Meta-Totorin, but can occasionally 1-shot a unit; hammers are nice there.
That electrifying Death/Ray Horn also likes to paralyze, so whips are nice. I'm not having any issues damaging this one, unlike the previous tigers. They are nonetheless, monsters to fight against.