Parsakzz
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no another book of author of BTTH they are 4 Book with Same verse BTTH ' WDQK And The Great Ruler Happening in same 3 thousand world but Dragon Prince Yuan is Another World Neighborhood To them With Different Cultivation System that 3 thousand World and Protagonist is Zhou Yuan who become Ancestral Dragon In End of novel
maybe all of plane have multiverse but door to Higher Dimension is closed or Even is destroyed. Edward Being Not prime but become prime because of merlin also make sense if you remember merlin one time say edward following legacy of arcane emperor in eariler chapter mayve arcane emperor was Prime Edward who reincarnated in Magus Era
We have in high tier typemoon - Maou Gakuin in peak tier SCP - Umineko no Naku i think
Maybe get him to meet remnant spirit of magus or even previous arcane emperor [ in one chapter merlin say he is legacy of arcane emperor we don't know who he is, but we know he was powerful even if merlin know him who know maybe get edward met his remnant spirit and become his true successor when edward reached tier 11 and become one with his self other timelines]