Serpentine Chaos

Chaos Strike: Once on each of your turns when you hit a creature with a melee weapon attack while your Bladesong is active, you can invoke the unpredictable magic of the Serpentine Chaos Table. Roll a d10 after the attack to determine the magical effect. On a 1, a backlash occurs; on a 10, a powerful boon is unleashed. You must finish a short or long rest before using Chaos Strike again.

Serpentine Chaos Table:

1. Conjuration | Unstable Portal: A minor tear in the fabric of space occurs. You and each creature within 5 feet of you take 1d10 force damage as reality snaps back.
2. Evocation | Erratic Spark: The target takes an additional 1d6 lightning damage, and a random creature within 10 feet of the target (possibly including you) takes the same amount.
3. Necromancy | Spectral Lash: The target must succeed on a Constitution saving throw or take 2d8 necrotic damage, and you gain temporary hit points equal to half the damage dealt.
4. Enchantment | Whispered Hex: The target is compelled to obey a single-word command from you (as per the command spell) on its next turn.
5. Abjuration | Arcane Aegis: You gain a +2 bonus to AC and are immune to the magic missile spell until the start of your next turn.
6. Divination | Foresight Flicker: You glimpse the immediate future, allowing you to reroll a single attack roll, ability check, or saving throw within the next minute.
7. Illusion | Shifting Shadows: The target is surrounded by illusory terrain, making it difficult terrain for your enemies until the end of your next turn.
8. Transmutation | Polymorph Jab: The target must succeed on a Wisdom saving throw or be turned into a small or tiny beast of your choice (as per the polymorph spell) for 1 round.
9. Enchantment | Binding Command: The target is paralyzed (as per the hold person spell) for 1 round.
10. Invocation | Celestial Convergence: You channel pure celestial energy. Your attack deals an extra 3d8 radiant damage, and you and allies within 10 feet of the target gain temporary hit points equal to the extra damage dealt.