Valgavoth - Interplanar travel

Previously, Valgavoth was able to temporarily force open doors to other planes, which he would use to lure in unsuspecting victims. But doing so cost him a lot of effort, and he could only manage to open one door every few years. Now, though, with the Omenpaths crisscrossing the Blind Eternities and making connections between planes easier than ever, Valgavoth has been able to reach other planes with much more ease. More and more people have been disappearing as Duskmourn's doors have become an increasingly common sight across the Multiverse.

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Planeswalker's Guide to Duskmourn