Hell is but a domain that bears sinners deep within the 9 rings. But not all within are spiteful sinners. Perhaps, rescuing them may offer...benefits that can help your cause
#Denizens Within Hell (Crossover Weapons)
glossy thicket
Limbo
A bridge between heaven and hell - a "paradise" to the unaware...
Crossover - Omori
Weapons:
Sunny's Knife (Find the artist awaiting his own self-inflicted judgement and protect him from himself) / Spell Something To Remember (Unleash an afterimage of your own grudges, to aid you within your suffering)
Mari (With the Artist, defeat the regal Minos and let his inner guilt spill out.) / Spell Something to Move Beyond (Drench the ground beneath you within your dreams and nightmares, siphoning what little life remains of them.)
Lust
Vast, tearing, a feeling that one wrong step will make you fall into your own sick fantasies...
Crossover - Ultrakill
Weapons:
King's Crown (Climb upwards and upwards still, till you discover a man-made paradise...and the crown of its' rightful judge, king, and father.) / Spell Flesh Prison (Imprison yourself within a vile tomb, mending your wounds and blasting apart anyone getting near.)
The Dawn (Find a mysterious boulder at the very bottom, and trace the glimmering road with stone within your hands.) / Spell Our King (Unleash a fury of strikes as brilliant as the sun itself, before unleashing the wrath of the boulder-burdened King in one tremendous explosion)
glossy thicket
@feral canyon What'd you think thus far?
feral canyon
I've been summoned thanks to my italian genes 
Hmm depends a lot on what the other weapons Will be in early access
glossy thicket
In order:
Sunny's Knife is a short jab (as in there's barely any range) with massive damage to make up for the short range and attack speed
Mari is a clone-type where you start with a free weapon choice. Whatever weapon you use, Mari will use as well, but she is only limited to 1 card for all her weapons each
King's Crown will have Dante throwing hands - purging her of effects like attack size or amount, but amplifying damage, speed, and effects applied
The Dawn has Dante sling forth a massive bolder to and fro akin to the Sisyphean Insurrectionist enemy in Ultrakill
feral canyon
Cloning cards Is too broken as concept, but support cards are very interesting
Like "this weapon card buff all horace's weapons dmg"
glossy thicket
Cloning cards Is too broken as concept, but support cards are very interesting
Picture it as such:
Mari can copy weapon cards, but like with other Weapon Cards, she can only equip 3 Support Cards.