The runic blade

The runic blade subclass focuses on offense and defense with varius abilities. You start with a Runic blade(reskinned greatsword) and can only use that blade, The blade is you, and you are the blade, you are bond as one. any attempts to use another weapons other than the blade, will lead to serious consequences. If you use another weapon, you will become paralized from the chest down and take one level of exhaustion per 10 min. This includes casting spells. you can still use your arm to move around.

Level 3: Fleet footwork

you become incredible mobile, so much so that your enemies cant catch you. after you make an attack, you can move 10 feet without provoking an opportunity attack

Level 3: Ki burst

once pr turn you can add 1d6 force damage to your weapon or you can use a bonus action to stun them. it deal 1d6 force damage. the save is DC (8 + proficiency modifier + strength modifier). you can use this equal to your strength modifier. the target is stunned until the end of the pc turn. uses gets reset per short rest.

Level 7: Valor

you can now use a bonus action to dash and gain temporary health which is equal to (2*con modifier + proficiency modifier). you can use this equal to your con modifier + your proficiency modifier. this last for a minute. uses get reset per short rest.

Level 7: Blade of exile

as a bonus action can you transform the runic blade to the blade of exile. While transformed, the blade of exile gains 5 feet range (10 feet total attack range), it gains +1 to its attack rolls and damage, deals an extra 1d6 to its attack and now you can move 15 feet without provoking opportunity attacks insted of 10 feet. use can use this once per short rest
when you transform it, you gain a new attack you can use called wind slash

wind slash
wind slash has a range of 60 feet (30 feet if it is a cone) and deals 4d8 force damage on a failed save and halv as much on a succesful save. the save is DEX DC (8 + proficiency modifier + strength modifier) you can use this once per short rest

Level 10: Deaths dance

When you take damage from anything, you can only take halv of the damage, but you also take the other halv as damage but over time. the other of damage gets taken on the end of the enemies turn. if you kill an enemy or the enemy that damaged you, you ignore the other halv and heal 1d6.

Level 10: Half way there

Your blade of exile now is a +2 insted of +1, you can move 20 feet without provoking an opportunity attack after you attack, deals an extra 2d6 damage on attack and wind slash now deals 8d8 force damage.

Level 15: serylda's grudge

Your attacks ignore both slashing and force damage resistances

Level 18: finalized

Your blade of exile now is a +3 insted of +2, you can move all your movement without provoking an opportunity attack after you attack, deals an extra 3d6 damage on attack and wind slash now deals 12d8 force damage.