What stone to upgrade next?

On my Lava, I currently have Lvl 4 attack, defense, and HP - all other stones are lvl 3. I'm having a hard time choosing which Lvl 4 stone I want next - crit rate or MP?

The extra MP would allow me one more use of "Power" on Quick Shot and little more movement but that's it. While crit rate would give me a 1 in 4 chance to crit, which sounds pretty appealing. So what do you guys think?


Also - any tips on how to get lvl 3 synthesis more often/reliably?

Thanks, I appreciate any advice

cri increase the higher damage chance,But more Mana lead to more power skill times and can always keep the damage at a stable level,so to me i'd upgrade Mana stone next

Cool. I kinda thought that was the direction I'd be pointed

Thank you

Mana or damage would also increase your Overall damage. But mana has more uses so mana first I'd say too.