Digging within, you stave off the call of death and surge renewed towards your foes.

When you are reduced to 0 hit points, you can use your reaction to heal a number of hit points equal to your proficiency bonus. 

You strike a spellcaster and disrupt their control over magic, fracturing the power behind a spell and transforming the energy so it roots them to the spot.

You charge a spellcaster in order to interrupt their spell.

When a creature you can see casts a spell, you can use your reaction to move up to your Speed. If you end your movement adjacent to that creature, you can make a melee weapon attack against it. On a critical hit, the spell is interrupted (expending the spell slot) and has no effect.

The potency of magic is dependent upon whoever wields it, and whether arcane or divine most spells and spellcasters pale in comparison to your obsessive conviction.

When you see a creature within 30 feet make a spell attack against you, you can use your reaction to defy it. The creature makes a spellcasting ability check against your maneuver DC or automatically misses with its spell attack. 

If the spell is of 7th-level or higher, this combat maneuver has no effect.

You interrupt a spell to stop it being cast.

As soon as you spot the workings of magic nearby you can reflexively draw upon your willpower to fortify your mind, body, and soul.

As soon as your senses seize upon the uttering of an incantation or a hand working the gestures of magic your body reflexively reacts with violence.

When a creature you can see within your reach casts a spell, you can use your reaction to make a melee weapon attack against it. 

Playing dead, you surprise your foe with a sudden attack.

You instinctively know when you hit an opponent’s weak spot and can muster an extra bit of force to devastating effect, causing your foe to suffer momentary fatigue.

The instant you sense an opponent has moved within your guard you immediately attack in response.