You tap into the deepest reserves of your life force, amplifying your physical abilities for a brief moment. This technique, however, takes a toll on your body, forcing you to weigh the risks of such overwhelming power against the challenges you face.
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Enhanced Vitality: As a bonus action, you expend a number of hit points equal to your character level to activate the Kaioken. Until the start of your next turn, you gain a +2 bonus to attack rolls, damage rolls, and Dexterity saving throws.
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Multiplicative Power: You can choose to increase the intensity of the Kaioken by expending additional hit points:
- Kaioken x2: Expend additional hit points equal to 2x your character level. Your bonuses increase to +4.
- Kaioken x3: Expend additional hit points equal to 3x your character level. Your bonuses increase to +6.
- Kaioken x4: Expend additional hit points equal to 4x your character level. Your bonuses increase to +8.
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Strain of Power: After using the Kaioken, you must make a Constitution saving throw (DC 10 + the number of times you multiplied Kaioken). On a failed save, you gain one level of exhaustion.
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Limitations: You can use this feat a number of times equal to your proficiency bonus before completing a long rest. After that, you cannot use the Kaioken again until you finish a long rest.
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