Thunderlord's Ascendancy

You channel the raw power of electricity, becoming a living conduit of thunderous energy. For the duration, the following effects occur:

1. Electric Aura: A crackling aura surrounds you, extending in a 10-foot radius. Any creature that starts its turn within this area takes 4d8 lightning damage.

2. Storm's Grace: You gain immunity to lightning damage. Additionally, you have resistance to all other damage types.

3. Chain Lightning Infusion: Your spells and attacks that deal lightning damage chain to an additional target within 30 feet of the initial target, dealing half the damage.

4. Lightning Surge: As a reaction, when you take damage from a melee attack, you can release a surge of lightning energy, dealing 6d10 lightning damage to the attacker. They must make a Dexterity saving throw for half damage.

At Higher Levels: When you cast this spell using a spell slot of 10th level or higher, the damage from Electric Aura and Lightning Surge increases by 1d8 and 1d10 respectively for each slot level above 9th.

Note: Thunderlord's Ascendancy is a spell of immense power, turning the caster into a living storm of electricity. It provides powerful protection, devastating offensive capabilities, and even a reactive defense against melee attacks. This spell is the ultimate embodiment of electrical energy for a high-level caster.