|This build aims to boost Maria's solid speed and not-so-solid attack (hence the need for an attack boon) to significantly higher levels, allowing her to snag kills effectively with smart positioning and buff usage.
Weapon: Both '"`UNIQ--item-276--QINU`"' and '"`UNIQ--item-279--QINU`"' are relatively accessible weapons with the maximum inheritable staff Mt of 12, maximizing Maria's offensive potential. Alternatively, '"`UNIQ--item-282--QINU`"' is equally strong and works with teams using units with '"`UNIQ--item-285--QINU`"'.
Assist: The ideal healing assist varies by team needs, but Creative and '"`UNIQ--item-291--QINU`"' are both solid options in that the former is Maria's default healing assist and can be performed at a 2-block range whereas the latter heals 10 more HP at a time.
Special: Slow+ is a useful defensive skill that can save Maria in a pinch. That being said, the newly released Fear+ offers an often useful Atk/Spd +6 buff to your team on activation and can be considered if one has the resources to inherit to Maria. Heal-boosting special skills such as Recover+ and Heavenly Light work as always.
A Passive: '"`UNIQ--item-306--QINU`"' is an offensively valuable skill for healers, especially for the already decently fast Maria, who is now able to not only hit harder but also double opponents more easily. '"`UNIQ--item-309--QINU`"' is an alternative but requires the use of some form of self-healing in order to be reliably utilized.
B Passive: '"`UNIQ--item-312--QINU`"' is a given for an offensive healer set, since it lets Maria deal damage to foes without the usual 50% staff damage penalty. This slot can also fit '"`UNIQ--item-315--QINU`"', with the Chain effect added onto the weapon via refine instead.
C Passive: '"`UNIQ--item-321--QINU`"' and '"`UNIQ--item-324--QINU`"' both take advantage of Maria's decent resistance stat to make it easier for her to double and kill low-resistance fast units in the former case and kill tankier foes in the latter case.
Sacred Seal: '"`UNIQ--item-327--QINU`"' patches Maria's mediocre attack up even further, letting her make more out of her other buffing and debuffing abilities shown above. Having assists heal more is a plus too.