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I once thought of a weapon that's kind of the opposite of the Daedalus Stormbow: this bow summons arrows outside of the screen too, except these go directly at you, and you can only control from wich point of the screen the arrows will be summoned. This could be useful in e.g. invations, when there are strong enemies far away from you.
More flails (real ones, not launched). Flails have been totally neglected, and deserve some more content. Plus, they're really cool. Actually, thinking about this makes me want to do a flail only run...
Preferably a bow, which shoots two arrows, and if you have two types of arrows you can shoot both types, and since it'll consume both or well, most likely the next shot of two arrows will be the same arrows as last time but not consume. Hmmm, no idea why but this kind of came to me on the spot.
Speaking of Gravity Guns, some sort of telekinesis magic/device could be interesting, as well.
Basically, a Magic Missile-like projectile that deals no damage by itself but can "pick up" enemies and other objects. Then you can throw your enemies at other enemies or solid ground, after which they take damage.
I have this persistent idea of what I call the 'chainsaw beam' which works much like the golden shower, except instead of a parabolic arc, it simply shoots out, and curves back to the user. The use rate is insanely fast, and it has very low knockback, which means most enemies will simply walk through the beam, getting chewed up by the twin streams until they die.