mabye it should cost some energy in my opinion but not to much

A mix if possible. Energy + Minerals + Alloys to construct the bombs used to do said glassing.

I think time would a good enough factor. Forcing the enemy to have to hurry up and stop them.

no because doing all that bombardment takes forever anyways

Energy + alloys makes the most sense in my opinion, since they're the resources you're using to build and maintain the ships that are doing the bombardment.

Don't add anything - Bombarding it takes away so much time that it is good price by itself

Or maybe just alloys, since the 'Nuclear Missile' weapon component only costs alloys. Maybe glassing would also cost Volatile Motes, since the more powerful missiles (Quantum and Marauder) cost those.

Though it may make it expensive, it would make sense for it to cost ENERGY. After all, the cover art for this mod (at the time) includes Covenant, who use plasma, a type of energy.

Im thinking of adding a pretty low cost: 1000 energy for glassing, 500 alloys + 500 minerals for nuking.

I'm really liking this. I'd say 1500 energy or so. I always end up with a huge reserve of energy to spend.

i don't see why it would cost anymore than it already does. That's imposing cost to munitions that are already buried in the cost of operating and maintaining a ship. If your nuking a planet the end result is glassing it if you stay there longer to continue till its uninhabitable.

To be real it should have political ramifications outside and possibly inside your own empire.

Maybe the cost should not be significantly more. Maybe like 200 alloys and 200 minerals per planet and 600 energy. This is pretty cheap change by the time you reach mid game. It just seems a little unbalance to glass a whole planet as an early space faring empire. The feat becomes easier as you become more powerful.

I think that the Glassing option should be given at around 20~30% destruction, assuming that you go off from halo lore; which states that the practice of glassing planets was not exactly common and didn't glass the entire planet due to the shear amount of resources it takes. The Covenant would only glass portions of the planet to make up a sacred symbol and glass the major settlements and infrastructure of the targeted planet.
As for the cost... I recommend the cost to be the following equation:
250 energy X # of built districts X # of buildings built. E.G. : 250 X 6 X 4 = 6,000 energy
Or perhaps (250 energy X # of built districts ) + ( 5 gas X # of built buildings)

IMO, I guess i don't see why staying longer to glass a planet, which is tying up your fleet anyway should cost a separate charge. Glassing just implies a longer bombardment which is reflected in the fleet being away from a station, and paying the maintenance for it. I don't see why there would suddenly be a separate munitions charge for bombardment of a planet. In the context of how this game is structured - munitions is all part of maintenance. This game does not get down to individual munitions costs. Now if you want to introduce that for all combat situations, basically introducing resupply and cost for expendable munitions such as missiles and kinetic weapons then maybe it makes sense. If you want to introduce a cost - do it through impacts to society whether on an empire scale or galactic scale- For example some societies experiencing unrest, that cost your empire money. Or a political cost with allies and the rest of the galaxy.

I think requiring any amount of devastation before the option to nuke or glass is stupid. I don't have my proton sweeping solution yet and I want to wipe out the fanatical xenocide empire already. I don't care too much about the resource cost. But aside from that, where is the logic to support that requirement? None! It's illogical!

I just want the option to make them gone when I want them gone. I can just terraform and revive the world later anyway.