Apokolips vs Thanos
I'm curious to see what opinions on this are.
Let us say that Darkseid and Thanos are made aware of each others' presence. Seeing the threat in each other, they gird for war. Due to some cosmic quirk, they are unable to cross into each other's universe for one year. However, they can gather data from the other universe through various means.
So this gives them each a year to plan, plot, and build up their armies and siege engines for the coming conflict.
What they cannot do is use omnipotent power points like the Worlogog or the Infinity Gauntlet or whatever. It all has to be stuff created by their science or it has to be people that would likely help him/work for him (ie, perhaps Thanos again gains control of the supervillain team he used in Secret Defenders, maybe Darkseid uses the Secret Society of Supervillains or any number of his minions).
Who takes it?