Soul of Iron

Crystal Core

Beginning at 1st level, you can use your crystal heart as a spellcasting focus for your sorcerer spells. You are always considered touching your crystal heart.

Heat and Voltage

Beginning at 1st level, fire and electrical energy swirl inside your crystal heart, allowing you greater control over these elements. After you cast a sorcerer spell of 1st level or higher that deals fire or lightning damage to a creature, you can cause a chain reaction to cascade to one creature you can see within 10 feet of a creature damaged by the spell. The target takes damage of the same type equal to the level of the spell cast + your Charisma modifier (minimum of 1). In addition, at 1st level, you learn one 1st level spell of your choice from any spell list that deals either fire or lightning damage. This spell is a sorcerer spell for you, but it doesn't count against your number of sorcerer spells know. If you replace this spell, you can replace it with a spell that deals either fire or lightning damage from any spell list, you must otherwise obey all the restrictions for selecting the spell.

Esoteric Data

Beginning at 6th level, your crystal heart amplifies your knowledge of magic and arcane arts. You learn the identify spell and can cast it as a ritual. This spell counts as a sorcerer spell for you, but it doesn't count against your number of sorcerer spells known.   Additionally, when you make a saving throw against a spell or magical effect, you can spend 2 sorcery points to add your Charisma modifier (minimum of 1) to the roll. You can choose to do this before or after you roll, but before you know the outcome of the roll.

Redirect

At 14th level, you gain resistance to fire and lightning damage. In addition, whenever you take fire or lightning damage, you can use your reaction to reduce the damage taken by half of your sorcerer level and redirect it to a creature you can see within 30 feet of you. The creature takes damage of the same type equal to half your sorcerer level.

Arcane Arc

Beginning at 18th level, you can arc out excess arcane energy from within you crystal heart. As an action, you can spend 4 sorcery points to unleash arcs of fire and lightning in a 30 foot radius centered on you. Each creature in the radius must make a Dexterity saving throw against your spell save DC. If a creature fails its saving throw, you choose either fire or lightning to arc to them, or you can spend 1 sorcery point to have both hit them.
Fire. Fire roars around the creature. It takes 2d12 fire damage and has disadvantage on saving throws until the start of your next turn.
Lightning. Lightning shoots through the creatures body, tensing its muscles. It is incapacitated until the start of your next turn.