Plane of Radiance + Lance of Endless Night = ??

[Welverin]

Nothing, the Plane of Radiance is the source of all light, not the sun so the lanc would have no effect on it. But then maybe I'm just a killjoy.

 

[The Goblin King]

Probably nothing. It might be interesting if the small sphere of darkness started to 'eat' the rest of the plane.

 

[thullgrim]

I would say something catastrophic to those in the immediate vicinity..as for the rest of the planes...I think suitable to the PC's home planes like a permanent eclipse. I could also see a plot hook where the lance get used and it starts a slow reaction across the plane. The catastrophic side effect: A hole is ripped into negative energy plane. Negative energy pleads into the positive plane and begins to dowse the celestial lamps.

 

[rkanodia]

Or, if you're in a more apocalyptic mindset, since the plane of radiance is connected to every lightsource in the multiverse, if you bring the lance there, you can use it to slay the eight sacred blind kobolds who guard the Torch of the Sun. The kobolds are immortal and come back to full life at the next round, and you have to kill them all before the Torch is vulnerable. Even then, it takes eight strokes to destroy the Torch, meaning you must somehow deliver sixteen blows in the span of six seconds. If you do so, and destroy the torch, every sun everywhere will collapse upon itself.

It's ridiculous, but doable. Dropping a weapon is a free action, right? So you whirlwind the kobolds and drop the lance. Next person picks it up, takes a swing at the torch, and drops it. Next person picks it up, takes a swing at the torch, and drops it. Keep going until it's gone.