Stasis is a new subclass type introduced in the new Destiny 2 Expansion Beyond Light. This allows Guardians to use the power of the Darkness to their advantage. Each Guardian's Stasis subclass will look a bit different to everyone else's. The Stasis skill tree is different to other subclasses because it doesn't use the same form of tree as the other Destiny 2 subclasses or the Destiny 1 node-based skill trees. The new skill tree has aspects and fragments that the player can use to make their subclass unique. Furthermore Stasis isn't instantaneously given upon getting the Beyond Light Expansion but rather you get it upon completing the first chapter of Beyond Light.
Revenant subclass Super Ability is called Silence and Squall. The first Kama freezes enemies in its radius. The second Kama creates a Stasis tornado that slows and freezes inside, and tracks enemies. (This can be reversed with way of the current super deflect.) Silence and Squall are the names of the two Kama blades, that the Hunter summons when casting their Super Ability.
The Behemoth subclass Super Ability is Glacial Quake, which covers the Titan's fist in a Stasis gauntlet.
The Shadebinder Super Ability is called Winter's Wrath, which allows the Warlock to summon a staff made of Stasis crystal and shoot 3 freezing orbs at a target, by pressing the right mouse button you will aim the staff in the air causing a shock-wave that will shatter all targets froze within a radius.
The Stasis subclasses have fragments to customize the gameplay of the subclass.