Lachesis staff

I'm building Lachesis as a healer for an all modes team and I'm trying to guess which weapon would suit best with her. i realized that with my (L) Tiki next to her she has nice mixed bulk and by now she's using absorb with wrathful refine, I can also give her dazzling b if needed, The team is composed of (L) Tiki, (H) Sakura and Ophelia. Ophelia is a bit weaker without another mage on the team but for me She's more useful than my bladetome nino