I concur that Gods have too much destructive potential as-is and their restraint is built upon contrivance and player consensus. We can not assume any of these things will be present in Divinus Lite. Even rules-as-written, a God can create a star for 2 MP in Divinus Lite, which would nuke a planet in a heart-beat.

It was suggested, and I agree with this, that Gods are to be far more creative beings than destructive beings. Specify explicitly that Might can only be used to create things, and that it cannot be directly used to destroy things; no nuking things, no dropping moons on people, no conjuring black holes next to planets, etc. This should help curb destructive behaviour and encourage creative solutions to conflicts.

How to handle powerful weapons is another matter though. Weapons are technically created, which means they are valid in a system where Might can only be used to create things, yet they can still be obscenely destructive if you invest enough Might into them. The no-MP-hoarding system helps mitigate the strength of weapons which can be created. We could set a hard limit on the power of divine weapons, such that they can't reach WMD power. We could specify that any uses of WMDs need to allow a response from the other players.

Or, alternatively, we could do away entirely with the concept of investing lots of Might into a single item (as Termite originally proposed). A divine weapon costs a flat 1 MP to build (as a blessed item). You could spend another 1 MP to add a different function to it, or build another divine weapon. But at no point would you be able to build a 25 MP death-ray.

Spending lots of MP on a single item was never in the rules-as-written, but we've house-ruled it in anyway. Divinus Lite should explicitly specify that you can't dump more Might on a single item/action to make it more powerful.