History of Code of the Commander

Code of the Commander is the middle ability tree of the Sentinel subclass for Titans.

Overview

The tree centers on Void detonators. Hitting a target with a Void ability attaches a detonator, and further hits make it explode, damaging nearby targets. Resupply restores health and grenade and melee energy to you and nearby allies when detonators explode. Tactical Strike causes a Void explosion when you melee an enemy, which also sets off nearby detonators.

Super

Banner Shield replaces Sentinel Shield as the subclass Super. Guarding with it creates a defensive wall. Allies who shoot through the wall deal more weapon damage, and guarding allies extends the shield's duration.

Unlocking

The Destiny 2 Wiki says the tree is unlocked by purchasing Destiny 2: Forsaken or Destiny 2: Shadowkeep. Destinypedia lists the Sentinel's appearances but does not describe the unlock.

Later changes

From the Void 3.0 update onward, Controlled Demolition appears as an Aspect with a revised effect, and Banner Shield and Tactical Strike are not listed (Destinypedia).