Involved in a ritualistic binding with a pit fiend, you are able to draw on his power in times of emotional turmoil, whether you want to or not.
There are three stages to the demon's influence. Every time you receive damage from any source, you must make a Wisdom Saving Throw equal to 10 or half of the damage, whichever is greater. On a successful save, you remain in the stage that you are currently in. On a failed save, you progress to the next stage, to a maximum of 3.
In the first stage, your eyes begin to flood with a deep crimson red that sheds dim light in a 5ft radius.
You also gain the following benefits.
• Advantage on Str/Con Saving Throws
• Advantage on Str/Con Ability Checks
• You may spend an Action to expel the demon's influence. This ends Chickigaku.
In the second stage, your physical appearance begins to take on much more drastic changes. Your stature increases until you are a Large size creature. Gnarled horns begin to protrude from your head, and your skin's color changes to that of a red demon. You retain all of the benefits received in Stage 1 and gain the following effects.
• +2 to Strength Based attacks
• Resistance to Bludgeoning, Piercing, and Slashing damage from Nonmagical weapons.
• You gain 5 Temporary Health per character level.
• At the beginning of your turn, you must make a Wisdom Saving Throw (DC = 10 + Character Level). On a Successful Save, you may continue your turn as normal. On a Failed Save, you make a Melee Weapon attack against the closest creature in range. If you can make extra attacks as part of the Attack action, you use those extra attacks, moving to attack the next nearest creature after you fell your current target. If you have multiple possible targets, you attack one at random. Your turn then ends.
• You may use an action to expel the demon's influence. This ends Chickigaku and you instantly revert back to your original form.
In the third, and final, stage, you are lost to the influence of the pit fiend as devilish wings sprout from your back and your feet become cloven. The following effects are applied.
• Immunity to Fire
• Immunity to Poison
• Your actions no longer belong to you. You act according to the DM's discretion until you fall unconscious or become helpless. After exiting this stage, your body reverts back to your original form. You suffer 5 Levels of Exhaustion after your mind and body suffer the near-full force of a demon's possession.