Burning thought
Restricted
No it turned him into that ridiculous entity....a beast, its arguable if he was really exdeath or if he had any other powers other than those shown in that form...
The void certainly did not help him, nor did it give him much power, simply made him a beast.....
Either way his void powers seem too slow to be used on Kain, and his void powers can consume him as well...it would be like Kain trying to rip the soul out of one of his opponents only for him to all of a sudden lose his own on his own power. Would be a bit useless wouldnt it...
Once Exdeath claims complete control over the Void, his power soars. He is now able to erase any part of existence with a thought, channeling the Void to engulf it and sending it into another random dimension. It is also a significant display of power when it is revealed that the only way the Light Warriors were able to defeat him was when his own power turned against him.
So...he thinks to call upon the power, how much concentration you would have to show me, and if it really is instant to call upon by thought, he has to channel the void, which sounds like he needs to keep it going himself (so he would be vulernable to attackers during the thought and the channeling) and thats if his power does not absorb him and turn him into a beast....
Note that Kain goes through dimensions quite often....in and out, his dimentional teleport would get him out and back to destroy Exdeath again since the void does not say that it destroys anything at all....