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Gate of Hell, a portal that opens between dimensions connecting Yggdrasil with whatever Hell is. It was opened through distorting space and time to an incredibly high degree, and it may only be closed by an equally powerful force, or someone with an incredible ability over Space and Time.
My affinities with both of those Elements is alright, but not the best, and certainly not near enough to allow me to fix Space and Time to such an extent even if I really wanted to… There is no Space or Time Dragon Bloodlines from all I know either and it's an incredibly rare pair of elements that only a few could ever wield, even less master.
Pandemonium's abilities are tied to his Unique Skill and might not be tied to his actual affinity with these two elements; therefore, he can do incredible things despite that.
However, the System's abilities could even surpass his. Her calculations were never wrong. If there was really a chance to do it, then we had to try!