Have you tested suvivor set vs lacryma + pororoca? I was always curious if it was worth it just for when you're spamming DD
Lac+Pororoca also neat to be used for Aqua Psychic wave, Cold Bolt Spell Fist and Waterball for Sorc who owns giant octopus card.
If you need cheaper overkill specific diamond dust spamming weapon, you can use chilly spellbook instead Bean, where you get free shoes slot choice.
As for complementary water magic boost can be fueled from other sources, if only brasilis and faceworm instance cards are soon to be introduced, it will be perfect match for the book.
and since the book is level 4 weapon you can harness full true celia card varetyr spear skill boosting effect, while retaining heavy dd damage.