In battle, you can call upon the innate magic within you to fight with magical ferocity. On your turn, you may enter a Surge of Power as a bonus action.
Surge of Power grants you the following benefits (all bonuses and temporary points are lost when the surge ends):
- When you enter a surge, you gain temporary hit points equal to twice your sorcerer level.
- When you enter a surge, you gain temporary sorcery points equal to half the sorcery points per your sorcery level on the Sorcerer table, rounded up (PHB 100).
- Advantage on constitution saving throws made to maintain concentration on spells.
- Once per turn, you may deal extra damage to one creature targeted by a damage-dealing spell you have cast this turn, or an on-going spell from a previous turn, equal to your sorcerer level.
Your Surge of Power lasts one minute. It ends early if you are knocked unconscious, if you have not cast a spell since your last turn, or taken damage since then. You may also end your surge early on your turn as a bonus action. Once you have used Surge of Power a number of times as shown on the Barbarian "Rages" column of the Barbarian table (using your Sorcerer level in place of the Barbarian level, PHB 47) you must finish a long rest before you can surge again.
As a result of this increased power in battle, your innate magic is harder to call upon when not surging. A sorcerer using this optional rule only has half the permanently available sorcery points on the sorcerer table per sorcerer level, rounded up. For example, a 5th level Sorcerer with the Surge of Power feat only has a pool of 3 sorcery points per long rest (5 halved, rounded up) when not under the effects of Surge of Power.