a consequence of Ymir's cosmic deluge.

While reading volume one of P. Craig Russell's graphic novel adaptation of Neil Gaiman's Norse Mythology, the immediate result from the death of primordial Ymir is shown in a panel as a giant wave of blood being released.

This is so enormous that the flood kills all but two of the jötnar, which implies that Ymir's sanguine deluge also drowns the giantess wives of Buri & Bor, and collaterally their grandfather & father as well if such a flood is on so large of a cosmically uncontrollable scale. Such a consequence would then explain why after the waves settle it is the third generation of Odin, Vili, & Ve that are left to craft & rule the Níu Heimar, while Buri & Bor are unmentioned after that, and maybe settle why such a cosmic creature as Auðumbla is absent as well.

This isn't necessarily the answer: There could just be missing stories, or the death of Ymir & universal creation passes forward ruler-worthy powers or status or both to the three brothers. The non-reappearance of their forefathers, and the divine bovine, does beg for an explanation, and perhaps in any of the above we have some possible NorsePlay'd solutions.

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Guillermo Maytorena IV knew there was something special in the Norse Lore when he picked up a copy of the d'Aulaires' Norse Gods and Giants at age seven. Since then he's been fascinated by the truthful potency of Norse Mythology, passionately read & studied, embraced Ásatrú, launched the Map of Midgard project, and spearheaded the neologism/brand NorsePlay. If you have employment/opportunities in investigative mythology,  field research, or product development to offer, do contact him.