Diamond Mind Disciple

True quickness lies in the mind, not the body. A student of the Diamond Mind discipline seeks to hone their perceptions and use their cunning, intellect, and feel for the battlefield against their enemies. Time seems to flow slower to a Diamond Mind initiate.

Stance of Clarity

When you take this archetype at 3rd level, you learn to hone in on a single target, analyzing their weaknesses and focusing all your efforts on striking them down.

You may use an action to designate a single creature you can see within 30 feet of you as your mark. While in this focused state, you have advantage on all weapon attacks against your mark, but all other creatures are heavily obscured to you. You must maintain concentration on your mark as though you were concentrating on a spell. You immediately lose concentration on your mark if you move more than 30 feet away from them.

Quicksilver Motion

At 3rd level you may use the bonus action granted by your cunning action to choose one target that you can see, this target has disadvantage on attack rolls against you until the beginning of your next turn.

Moment of Perfect Mind

Starting at 9th level, you have honed all your senses to the extent that you can take a brief moment to perfectly analyze your surroundings. 

You may use the bonus action granted by your cunning action to gain blindsight with a range of 30 ft until the beginning of your next turn.

Insightful Strike

By 13th level, you have learned to identify and take advantage of any opening left by an attacker. If an enemy makes an attack roll against you with disadvantage and misses, you may use your reaction to immediately make an opportunity attack targeting them. This attack can’t benefit from your sneak attack feature.

Time Stands Still

At 17th level you can take further advantage of any openings left by your enemy and unleash a flurry of quick, studied blows against your mark.

When you deal sneak attack damage to your mark, you may immediately make two additional attack without advantage against your target. Each of these attacks deal damage equal to half your sneak attack damage (rounded down) on a successful hit. Immediately after using this ability you lose concentration on your mark.