As I promised awhile ago, here’s my conversion of the allip to 5e rules. I based it mostly on the d20 SRD and the Pathfinder SRD, but changed the Wisdom drain abilities to conditions. The touch of insanity attack I based off of the harried condition created by Brandes Stoddard over at Harbringer of Doom.
Welcome traveler from an antique land.
You hold in your hand one of Dr. Rudolph van Richten’s numerous notebooks. In his travels, Dr. Van Richten took copious notes that later led to the publication of his many Guides.
This is some of what he has seen. The unheard of monsters, who slither and bite. Wondrous items and and artifacts he has found, their mysteries yet to be unlocked. Of the vexing spells and enchantments he has encountered.
Seven monsters, six spells, and nine magic items!
Bestiary includes the allip, amorphous blob, bloody bones, cobweb golem, dry bones, skotos, and slaugh.
Spellbook includes amorphous blob, creeping darkness, crimson scourge, undead control, vampire mist, and wall of bones.
Magic items include the cloak of night, eyes of the undead, gauntlets of the ghoul, ring of lycanthropy, skull mask, spectre wand, sword of night, trumpet of doom and withering scythe.