Although each band boasts its own distinct style, the combination is appropriate in that it perfectly represents two of the evolutionary offshoots that have recently begun to carry the genre in new directions. Howls of Ebb (HoB) first established its brand of “limbonic metal” with its debut full-length, “Vigils of the 3rd Eye,” and has further refined it with a subsequent EP and most recently with its second album, “Cursus Impasse: The Pendlomic Vows.” The three tracks that comprise HoB’s side of this split, dubbed “With Gangrene Edges,” pick up where the band’s previous recording left off. Once again, HoB weaves a disorienting web of atonal riffs that lurch forward and backward at the same time, appearing to progressively pull each song apart at its seams before resolving into an uneasy oblivion. At the same time, Khthoniik Cerviiks has found itself on a similar point in its trajectory after having released three demos and its 2015 debut album, “SeroLogiikal Scars (Vertex of Dementiia).” With five tracks collectively entitled “Voiidwarp,” Khthoniik Cerviiks’s contribution to this split forges into similarly dissonant dimensions as those of HoB, highlighted by two nine-plus-minute songs that proceed along and teeter upon a treacherous precipice as would one without the foresight to know whether the next step will be the last. In order to visually reflect the dementia presented musically on this recording, Howls of Ebb and Khthoniik Cerviiks summoned the genius of Timo Ketola and Khraâl Vri*ïl, respectively, to adorn each side of the LP jacket.