The serpent stirred at the approaching footfalls - a telltale sign of incoming prey. It uncoiled its sleek body, muscles rippling under silvery blue scales, and dove into the floor, passing through the ancient flagstones and into the misty mirror universe of the Ethereal Plane. It slithered through curling wisps of vapor until it came to a place where it sensed the echoes of creatures on the material plane. Slowly, cautiously, it passed its head up through the floor behind the interlopers. There were four of them, two in gleaming metal armor, one in flowing robes, one in black padding.
Like flowing water, it lunged, piercing the robed one with its long fangs, then dropped back through the floor and into the ether. The one bearing its venom glowed, visible to the serpent even across dimensions. It followed the warm glow of the venom as the material creatures continued through its lair. When it judged the time to be right, it found a passage through the ether to the ceiling of the room the prey were in. It struck boldly now, hissing and rearing. At it attacked, it blinked back and forth between ether and material. One of the prey swung a cruel sword at the serpent, but the blade passed through curling mist as the creature popped back to the Ethereal Plane for a split second.
Taking advantage of its distraction, the black padded prey cut deep into the serpent with twin short blades. The serpent recoiled into the ceiling. The black one was a greater threat when part of the group. It needed to be isolated. The serpent sprang out of the ceiling, barreling into the black figure, sinking its fangs deep into its shoulder and pushing it into the floor and through it, dragging it into the shrouding ethereal mists that lay just beyond the edge of the material world. The black padded figure was startled. The serpent tasted its fear on the air. It tried to strike back at the serpent, but the silvery beast simply coiled around it, biting it again and again.
Suddenly, there was a burst of flame searing the serpent's hide. The serpent turned to find the robed prey blinking erratically in and out of the Ethereal Plane. It was terrified even as it blasted the serpent with another gout of flame. The hunter reared back and struck, but it bit down on nothing as the robed one blinked away. As the serpent hissed in frustration, the robed one reappeared and unleashed a crackling bolt of deadening energy which struck the serpent square in the snout. It felt heavy. It tried to pursue the robed one back to the Material Plane, but it couldn't make a passage there. The ethereal connections to the solid world were closed to the serpent by some magical force. It could only watch angrily as the three remaining prey, still lit up with the serpent's venom, passed deeper into its lair.
It watched, and it waited.Today's Monster Monday is the phase serpent, a silvery hunter from the ethereal plane. Armed with an array of dimension-defying abilities that let it strike from anywhere, this slithering terror is the perfect ambush predator to stalk the halls of any dungeon.
The following text in gold is available as Open Game Content under the OGL. Open Game Content is ©2017 Jonah Bomgaars.






