You were born with a powerful technique that creates a weak spot on a 7:3 ratio
Cursed Energy
Starting at 1st level, you can harness your negative feelings into a usable source of energy, called cursed energy. These feelings can be harnessed into attacks or abilities. The number of cursed energy you possess is based on your class, some classes use a modifier that being charisma or wisdom (Player’s choice)
Your cursed energy DC is 8 + user cursed energy ability modifier + proficiency bonus.
Critical Focus
Beginning at 1st level, you gain a +1 to critical range. Additionally, you roll an additional damage dice on a critical hit.
Ratio
Once you reach 3rd level, you have learned your technique that creates weak spots in enemies. Whenever you hit an attack, you can spend 1 cursed energy to roll a d10. If you roll a 3 or 7 the attack becomes a critical hit.
You now roll 2 additional damage dice on a critical hit.
Collapse
When you reach 6th level, as an action for 4 Cursed Energy, you make an attack to destroy the ground around you in a 30 ft circle, applying your critical hit to the rubble. The area becomes difficult terrain and every creature in the area must make a Dexterity saving throw. On a failure, they take your attack’s damage + 3d10 bludgeoning damage. On a success, they take half as much damage.
You now roll 3 additional damage dice on a critical hit.
Improved Ratio
At 11th level, you have become more lethal and precise with your Ratio. When you use Ratio, you now roll 2d10 instead of one and you can spend additional CE up to your Cursed Energy modifier to roll an additional d10 per CE spent. You roll 4 additional damage dice on a critical hit.
Domain Expansion: Golden Ratio
Finally, at 18th level, you have honed your skill with your technique to a fine edge. In your domain, all of your attacks count as critical hits and you deal an additional 5 damage dice on a critical hit.
Reversal
反転 How to gain this: Cursed Technique Reversal →
Inverse Ratio
With great mastery over the Reversed Cursed Technique, you have found the reversal of your technique. You have learnt how to invert your own ratio, placing it onto yourself to develop weak points but the effect causes all areas excluding those weak points to be reinforced beyond comparison.
As a bonus action or reaction whenever an attack is made against you or you roll a saving throw for 8 cursed energy, you can impose the ratio onto your body for a number of rounds equal to CE modifier (minimum of 1). By doing so, you roll a d10 every time an attack roll is made against you or you make a saving throw. If you roll anything other than a 3 or 7, you gain resistance to all damage taken, damage reduction equaling half of your level, rounded down (damage reduction occurs after damage resistance), and any damage resistance you have prior to placing the ratio onto yourself becomes damage immunity.
If you roll a 3 or 7, the attack roll hits regardless of your AC or you automatically fail the save.