Chained One

A chained one uses agony and suffering to attack his opponents, dealing more damage the less health he has, and has a high chance of hurting himself. Chained ones store piercing chains inside of themselves, waiting to fire attacks from the palms of their bloody mangled hands.  Every attack has a 33% chance of failing (determined by d100 roll), if an attack fails they damage is instead dealt to the chained one. 

Redirected Agony

Beginning when you choose this archetype at 3rd level, every 5 points of lost health corresponds to 1 point of extra damage

Piercing Grasp

Starting at 7th level, on to hit roll 15-20 your attacks grapple the opponent and make them bleed, dealing 3 damage every turn, this damage is affect by your CON modifier. In addition your unarmed attacks deal 2d4, piercing damage, cause the opponent to bleed, and cannot fail.

Excess Torment

At 10th level, You can damage yourself by pulling the spiked chains tied around you tighter, this causes searing pain inflicting 1d10 piercing damage to yourself, and every 5 points of damage taken corresponds to an extra 2 damage dealt per attack

Expel Chains

Starting at 15th level, The chains that wrap your body and bones can be expelled from your body at your enemies dealing massive damage, 5d10 piercing to be exact. You can choose to deal this damage just to the enemy, or to your enemy and yourself, if you take the later option, your opponent will take twice as much damage as they initially were supposed to. An enemy hit by this attack and then later grappled will instantly die if they are below half health

Chainless one

At 18th level, At 10% health you may enter a chainless form, the chains of your body are removed and you transfer your soul to them, you can take no damage in this form, and deal twice as much damage, but if you stay in it for longer than 2 turns you die. Once you leave the form you cannot attack for 1 turn and you take 15 damage