Homebrew Demonic Lycanthrope Species Details

One of the most ancient and feared of all curses, lycanthropy can transform the most civilized humanoid into a ravening beast. In its natural humanoid form, a creature cursed by lycanthropy appears as its normal self. Over time, however, many lycanthropes acquire features suggestive of their animal form. IN that animal form, a lycanthrope resembles a powerful version of a normal animal. On close inspection, its eyes show a faint spark of unnatural intelligence and might glow red in the dark. Evil lycanthropes hide among normal folk, emerging in animal form at night to spread terror and bloodshed, especially under a full moon. Good lycanthropes are reclusive and uncomfortable around other civilized creatures, often living alone in wilderness areas far from villages and towns.

Curse of Lycanthropy

A humanoid creature can be afflicted with the curse of lycanthropy after being bitten by a lycanthrope, or if one or both of its parents are lycanthropes. A remove curse spell can rid an afflicted lycanthrope of the curse, but a natural born lycanthrope can be freed of the curse only with a wish.
A lycanthrope can either resist its curse or embrace it. By resisting the curse, a lycanthrope retains its normal alignment and personality while in humanoid form. It lives its life as it always has, burying deep the bestial urges raging inside it. However, when the full moon rises, the curse becomes too strong to resist, transforming the individual into its beast form - or into a horrible hybrid form that combines animal and humanoid traits. When the moon wanes, the beast within can be controlled once again. Especially if the cursed creature is unaware of its condition, it might not remember the events of its transformation, though those memories often haunt a lycanthrope as bloody dreams. A natural born lycanthrope can instinctively control the curse. Despite this inherent mastery, they too feel the pull of the beast within when the moon is fullest.
Some individuals see little point in fighting the curse and accept what they are. With time and experience, they learn to master their shapechanging ability and can assume beast form or hybrid form at will. Most lycanthrope that embrace their bestial natures succumb to bloodlust, becoming evil, opportunistic creatures that prey on the weak.

Demonic Lycanthrope Traits

shapeshifters who can transform between a humanoid and an animal form, or a hybrid form combining both.

Ability Score Increase

Your Strength score increases by 2, and your Constitution score increases by 1.

Shapechanger

You can use an action to polymorph into a Medium Wolf-Humanoid hybrid or into a Medium Wolf, or back into your true form. Your statistics, other than size and AC are the same in each form. Any equipment you are wearing or carrying isn't transformed. You revert back to your true form if you die.

Wolf-Humanoid Hybrid Form

Your size is Medium. You have natural armor equal to 11 + Dexterity Modifier. You gain the Bite attack and are considered proficient: Melee Weapon Attack, one target, 1d8+Strength piercing damage. If the target is a humanoid, it must succeed on a DC 10 + Constitution Modifier, Constitution Saving Throw or be cursed with werewolf lycanthropy. 

Wolf Form.

Your size is Medium. You have natural armor equal to 11 + Dexterity Modifier. Your walking speed is 40ft. You gain the Bite attack and are considered proficient: Melee Weapon Attack, one target, 1d6+Strength piercing damage. If the target is a humanoid, it must succeed on a DC 10 + Constitution Modifier, Constitution Saving Throw or be cursed with werewolf lycanthropy.

Infernal Resistance.

You gain resistance to fire damage.

Keen Hearing and Smell.

While in your Wolf-Humanoid Hybrid form, or your Wolf form, gain advantage on Wisdom (Perception) checks that rely on hearing or smell.

Darkvision (Wolf or Hybrid form only).

If you have Darkvision, you can see in Dim Light within a specified range as if it were Bright Light and in Darkness within that range as if it were Dim Light. You discern colors in that Darkness only as shades of gray.