Lusus Naturae (plus a new 5E monster conversion)

It will be arriving a bit later than planned, but I'm happy to hear that +Rafael Chandler's Lusus Naturae is in the final stages. The book is an utterly gruesome old school bestiary using the Lamentations of the Flame Princess rules set (meaning it's compatible with most old school fantasy games and even 5e with a  little work). I've already converted one of the preview monsters over to 5E. You can can check the preview and read about the nasty thing here.
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Shadhavar

Large monstrosity, Chaotic Evil

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Armor Class 15

Hit Points 53 (7d10+14)

Speed 60 ft

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  STR     DEX       CON      INT      WIS       CHA

18 (+4)  12(+1)   15 (+2)   15 (+2)   12 (+1)  14 (+2) 

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Saving Throws: Wisdom +4, Constitution +5

Skills Deception +5

Senses passive Perception 11

Languages Common

Challenge 2 (450 XP)

Unicorn Form. The Shadhavar can transform into a white unicorn. While in this form the Shadhavar’s alignment appears to be LG for the purposes of alignment detection. In addition, creatures riding the Shadhavar are gain Condition Immunity Poison and Damage Immunity Poison.

Project. Between sun and down, the Shadhavar can take a shadowy spirit form and stalk prey. In this form it gains: Damage Immunity from bludgeoning, slashing, and piercing from nonmagical weapons.

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Multiattack. The Shadhavar can make two gore attacks.

Gore. Melee Weapon Attack: +8 to hit, reach 5 ft., one target.  Hit: 10 (1D8+5) piercing damage.

Slow Impalement. The Shadhavar targets a sleeping opponent. The target must make a Constitution saving throw (DC 13) or take 3d6 on a failed save, half damage on a successful one. The injuries are not sustained until 2d4 hours after the victim awakens.

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Keep an eye out for Lusus Naturae. I'm sure it will shock and appall you in all the right ways.