Mundus can create a planet on the whim. He created outer space so that Dante and him could do battle. A planet can be destroyed just as easily as he could create it by mundus. As for the embodiment, asura would have to be hopeful in finding out just how to hurt him, his body isn't under the laws of the human realm, which is what asura is limited to.
Mundus created a large, vast pocket demension, that far larger than a planet. Don't know how large, but dante and mundus were in space flying at unknown speed at the same time mundus was also creating large rocks and hurling them at Dante( can't image good ol dante destroying planets since he's the good guy). And embodiment is the demon king, very powerful which I'll talk about later.
Building space >>>>>>>then a planet. Don't underscore Mundus. The Oedipal (which is Oedipus complex. It's a positive libidinal feelings of a child toward the parent of the opposite sex and hostile or jealous feelings toward the parent of the same sex that may be a source of adult personality disorder when unresolved. So it's a jealous 0 prevention.) events of dmc will lead us to believe that mundus is a god. Okay, remember the great deal of power mundus showed was to eliminate blowing up the planet. KEEP your eyes on the sky, a composite of ROCKS that were created by Mundus in his fight with Dante could be a planetarium exhibit of solar eclipse (pocket demension). So it's a celestial event that could be obvious and scary if a Mundus toss planets at Dante because the creator doesn't want it displayed as childish (pocket demension is enough), or like he's trying to make a huge feat for Dante. They couldn't do it like bayonetta where she forces the villian into the sun after passing planets, because the destination or intentions is the sun and a Mundus isn't being killed by the sun. Darkness beginning in mundus phenomenon is a high-end partiality of his most profound "chasing eclipses"! So until a Mundus find the right combination, it won't be great because Dante's attacks are relentless in fighting him. So hurling planets at Dante will make a demonstration of the deity special, but representatively totality expired crowd (it may be viewed as lame after already making a pocket demension).