Rise of the beast weapons is basically: Go fucking nuts if water.
Both are really really legit actually* :v
Fire Katana is the only other 'priority' weapon because it is so much better than like the entirety of fire's other weapon pools. Everything else is passable and I'd almost suggest going for the gold nuggets (atleast enough to make one brick) because this is kind of a BIG finale and we might not see celestials again for a bit.
*rabbit may only be guessing on the fist but tbh it's downside sounds pretty acceptable for the position, but it might not be optimal still.
If you just want a weapon from this event for your water team, I recommend the water/Genbu hammer. It'll be a good stat stick and add-on if you decide to mlb it. The spear is also recommended since SSR wind spears are hard to come by if you plan to use a lancer for your wind team.
Tiamat Spears exist, HP passive or no, so I wouldn't say Qinglong spear is super necessary.
Luxury even, really, but that's another story.
Edit: Also really the norma 2 weapon for your element is also always a nice pickup.
But yeah.
EditEdit: also tbh you prolly want a tia spear if wind anyway because 30% or so free hp is uh actually pretty nice from a single weapon.
It's not ygg staff and definitely no chev sword, but evennnntually you kinda might want increased survivability over a norma weapon or such. And it offers definite amounts more than a baha sword even discounting HL Baha weapons.