I love this so much. I have to figure out a way to work this into my next sssion.
Welp, that was fun, ready for the new setting next session?
Lol. I would obviously need to work in some fun and potentialy precarious radiance immunity mechanic.
Going to become insanely OP when I find a way to make myself immune to radiant damage.
Plumbum Armour, but I’m concerned about the movement…
And the reduction of your Intelligence stat after you wear it

When you’re doing 30d12 to everything within line of sight, movement penalties become less of a concern.

Let my enemies behold their slowly-approaching, inevitable doom!

They won’t be able to see you, but there are like 30 other human senses + made up ones
Lead lined armour with tinted lead crystal face shield, lead woven gambeson and skull cap… you can’t have any gaps.
Wouldn’t it be easier to make radiant armor around the core and use it like a laser with a very restricted line of sight?

“Hey big bad guy, wanna see what I’ve got in my lead box?”

BBG: “Huh?”

*opens box*

BBG: 💀

Non-magical??

This is literally one of the most magical things we have.

Magic rock go boom
This reminds me that there’s a quick reference in the Mage Errant series that one of the most powerful characters in the world actively hunts down and exterminates anyone who shows an elemental affinity to a “poisonous yellow stone”, fearing it’s power and potential for unintended harm to the user and those around them.
Look at that child radiate happiness! They’re positively glowing!
As a boring killjoy D&D rules lawyer, I might point out that this will definitely lead to “them” winning, since you are killed when you attune, and therefore can never deal the 1d8 bludgeoning + 30d12 radiant damage.
Past a certain point death is a formality in d&d, so I don’t think that’s true.
I thought death broke attunement, and you had to reattune after being resurrected?
You are right, forgot about that. But someone else mentioned already it’s nonmagical so i guess the attunement caveat is just for flavour
Nothing to attune to hear. You clap balls, they die. Anyone can do it!
The effect is not instant, you only day days later. Short term (like a fight) there is no change.
Mmm this is a good interpretation. You get radiation poisoning and only die later. If for whatever reason, this item appeared at my table and we needed to adjudicate this, I would totally accept this reading.
Oh sure, but when I created the plutonium golem, that was too dangerous. Pfft.
Would have to be heavy enough that you couldn’t move. You’d be a sitting duck for the bludgeoning damage
“Ah, but I have relentless endurance!”
On one hand it probably should just be fire damage, but I also like the idea that radiant damage type is just radiation.
I mean technically fire damage is also radiation, and cold damage is… Entropy? Anti-radiation?
A video ontopic to such weapons: youtu.be/0sjctSy0vL4
Redesigning Your Demon Core Weapons

YouTube
If you carried it long enough, you’d have a pretty good chance of gaining a mutation that prevents HP loss from the cancer cells.
If we were still on Reddit, I would link r/explainthejoke. What is this about?
Demon core - Wikipedia

Oh. Yeah. That just screams Darwin Award.