Looking at the new Cave Biomes in 1.17, I can imagine it'd be a pain to light them up and find every ore. That is why I think we need some kind of throwable/shoot-able light source that would ideally, stick into walls like an arrow. Considering Crossbows already fire different kinds of projectiles, what's one more? I propose a "Flare" or "Light Arrow", that would act as a long range deployable light source.
Perhaps, it could even be an "Impact Arrow", where the impact of it hitting a surface causes a flash of light. Or more simply, Spectral Arrows could simply now glow.
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