#light cantrip

my logic was with the light cantrip, you can change the color, so with that logic you can modify the wavelength however you like, meaning I can make the wavelength so short it can give you cancer

Light is a cantrip that I always grab when I am playing a spellcaster (especially one without Darkvision). This spell has TONS of uses and overall is a very fun spell. I've compiled a bunch of uses that I can think of for one of my favorite cantrips.

Before that! I am going to put the description of Light here:

You touch one object that is no larger than 10 feet in any dimension. Until the spell ends, the object sheds bright light in a 20-foot radius and dim light for an additional 20 feet. The light can be colored as you like. Completely covering the object with something opaque blocks the light. The spell ends if you cast it again or dismiss it as an action.

If you target an object held or worn by a hostile creature, that creature must succeed on a Dexterity saving throw to avoid the spell.

Without further ado, here we go!

A source of light underwater!

Signaling messages to another person silently (i.e., green light=all clear, red light=enemy ahead)

A guard distraction! Light a pebble and chuck it down a hallway. Make it an orange light to make it seem like there's a fire.

Create a poor man's Bullseye lantern by Lighting a small object and covering it with your hands. Also good for signaling without giving away your position.

Have a dark pit? Light a pebble and drop it down so you can see how deep it is.

Have a party member hold a Lighted item, then drop the spell to signal them to do a coordinated attack!

Make an item glow red, cover all but a tiny hole, and you've got a laser pointer.

Can't find firewood? Is your firewood too wet? You've got an (almost) resourceless source of light!

Feign a magic item by making it glow. Use this for scamming someone, intimidation, and more!

Cast Light on a retreating creature to follow them easier

Delight children by making their toy glow their favorite color!

Light an arrow, shoot it into an enemy. If they turn invisible, you've got a glowing arrow to give you their location!

Dark vision does not let you see colors, and is negatively impacted with dim light. Light is here to help you out!

This one depends on your DM, but Light a spool of thread, and you've got 30 feet of light to string around your camp! The downside is that you realistically need to roll it back up after an hour to relight it.

Going back to the Spool of Light, you can use it to leave a glowing trail behind you!

You can use it as a timer! Light an item, and you'll know when an hour is up. Great for tracking watch shifts, baking bread, and how long someone has been gone.

You can time a spell affect! If you have a spell that lasts an hour or more, the light spell can give you an indication of how long you have left on the spell! Cast Light 5 minutes before casting a spell that lasts an hour, and you've got a 5 minute warning before it drops.

Ward off a creature that is affected by bright light!

Get a scroll case, put a Lit pebble inside, and you've got a flashlight! Bonus if you put a mirror at the back of it to make it brighter!

This also depends on your DM, but if you cast Light on a stick of chalk, charcoal, or pencil, you could write glowing messages that last up to an hour! These things write by rubbing off part of itself onto surfaces. The spell does not say that Light ends if the item breaks, so RAW, I say that this works. But again, up to your DM!!

For an even bigger distraction, put a Lit pebble in an opaque, breakable container. Think: bottle painted black. Toss it into a dark room, and you've got a loud noise, and a bright flash of light. Good signal too!

Light is a fun cantrip to roleplay your caster practicing! Chilling at camp, your caster could practice turning a rock red, then purple, then blue, etc.

Pull a Mushu, use Light to cast a larger shadow and seem bigger to enemies around the corner

Use it to make shadow puppets!

Similar to the Spool of Light, you can cast it on a coil of rope and uncoil it to light your descent! A coiled 50ft rope fits within the 10ft cube dimension for the spell!