Stalemate. Dispel Bound makes it impossible for then to kill Darsh. Avatar of death makes it impossible to kill Thanos. Mind ****ery is not possible either as Darsh is immune. It would just be an insane battle that would probably wreck the universe. The only way this could be resolved is via outside means only found in plot.
One of the few intelligent posts of the thread.
Darsh in this state is, alone, a threat to Thanos and Darkseid.
To all those saying that regular Darkseid is universal level (or even above that), you really need to do your homework. He isn't even close to that level without some kind of extra power (and for the record, neither is Thanos).
Asura could certainly help in this battle as well (Broly, not so much). People much weaker than him have been able to at least slow down or cause problems for the likes of Darkseid (e.g. Superman).
If the 'no death' thing applies to Thanos, then I don't see how this could end. It would probably end up being Thanos vs Darsh, but I don't know enough about the latter to say if he could do anything to put Thanos out of the fight for good. Without the death immunity, my money would be on Darsh to take home the win in most cases.