Summary: You carry a dormant strain of lycanthropy, a secret you inherited from your past. While the full transformation hasn't manifested in many years, the curse subtly influences you.

Benefits:

• Blood Sense: If you catch a strong smell of blood, you have advantage on Strength (Athletics) checks and Dexterity (Acrobatics) checks until your next short or long rest.
• Keen Eyes: When your hit points drop below half your maximum, you gain darkvision 60 feet until your next short or long rest.

Drawbacks: 

Fire Aversion: The sight of flames ignites a torrent of agonizing memories from your past. Whenever you are targeted by a fire-based attack or are caught in a dangerous amount of fire (determined by your Dungeon Master), you must make a DC 13 wisdom saving throw or become Haunted by Flames. On a failed save, you are overwhelmed by visions of your fiery tragedy.

• Haunted by Flames: For 1 minute, you are frightened of any creature or object that uses or embodies fire. The searing heat and flickering flames trigger vivid flashbacks.
  You have disadvantage on ability checks and attack rolls while the source of your fear is within line of sight.
  You can't willingly move closer to any source of fire.
  Haunted Echoes: During this time, the visions and echoes of screams can be distracting, but you are not completely blind or deaf. You can still perceive your surroundings with some difficulty.
• Recovery: After 1 minute, the visions fade, and you regain control. You are shaken but not permanently incapacitated. However, you are left feeling emotionally drained and vulnerable. You have disadvantage on wisdom saving throws for the next hour.

Partial Transformation (Optional Rule):

This optional rule allows you to tap into the dormant power of your lycanthropy during moments of dire need. However, this power comes at a cost. Discuss this feature with your Dungeon Master before using it in your campaign. They can adjust the mechanics and effects to fit the overall power level of the game.

Triggering the Transformation:

When your hit points drop below half your maximum, you must make a DC 13 wisdom saving throw. Your senses sharpen – you scent the air like a wild animal, and see in the dimness with newfound clarity. This surge of awareness is a warning, a glimpse of the beast slumbering beneath your skin. On a failed save, you succumb to the transformation. You can choose to fail the saving throw to embrace the beast's power or attempt to resist.

Partial Transformation

• Beast's Fury: When a partial transformation occurs, a primal energy stirs within you. A bestial rage takes hold, and razor-sharp claws erupt from your fingertips. Your movements become more primal, your reflexes faster. A low growl escapes your throat, a mix of fear and fury.
  You gain a bonus to your movement speed equal to your Monk speed bonus.
  You sprout sharp claws that deal 1d6 slashing damage as an unarmed strike (in place of your unarmed strike).
• Beastly Flurry: As a bonus action while partially transformed, you can make an extra attack with your claws.

End of Transformation:

At the end of your turn or if you are incapacitated, the transformation ends. You regain control but are exhausted for 1 hour. You can choose to spend one ki point to avoid exhaustion.