Your nervous system is rewired to replace the slower, more organic processes with lightning-fast optical fibers, leaving almost no lag time between brain and muscle. This allows you to react and move in ways that seem superhuman. At tier 4, you can pre-program your body with muscle memory, so it responds to a given situation without requiring active thought.

Tier 2. You gain a +2 bonus to Dexterity ability checks and Dexterity saving throws. You roll for initiative with advantage, and opportunity attacks against you have disadvantage.

You can take an additional reaction, and when you do so, you gain a +2 bonus to your AC until the end of your next turn. You can’t use this ability again until you finish a short or long rest.

Notes: Bonus: Dexterity Ability Checks, Bonus: Dexterity Saving Throws, Advantage: Initiative