Watcher

Use the Terrain to Encumber Enemies

Watchers are experts in using the terrain to manipulate and hamper their enemies, focusing on strategic usage of the area to control and direct the flow of battle. They are experts in reading their enemies and are always on the lookout for opportunities to misdirect their foes towards their demise.

Observant Eye

You gain the observant feat. 

When a creature within 30ft of you is invisible, you can sense their presence and exact location.

You also gain advantage on perception checks made when overlooking areas that are at least 30ft lower than your current position.

Nimble Lure

When a creature makes a melee attack against you, you can use your reaction to move 5ft away from the creature and force the attack to miss if you are out of it's range. If the creature attempts an opportunity attack, you can force the creature to make a Dexterity saving throw. On a failure, the creature's attack fails and it falls prone (if able) as you take advantage of the terrain to trip it. You can only use this ability a number of times equal to your wisdom modifier (minimum once) per long rest.

Height Advantage

Using you knowledge of physics and identifying weaknesses from your vantage point, you gain advantage on ranged attacks made on creatures 10ft lower than you as well as melee attacks made on creatures 5ft beneath you.

Environment Manipulation

When you miss a melee or ranged attack, you can create an environmental effect in the space where the attack was directed. The effect depends on the type of terrain as follows:

Solid. The ground erupts upwards as debris is flung into the air. Any creature occupying the space takes 1d10 bludgeoning damage.

Soft. The ground gives way and any creature occupying the space's foothold sinks downward. The creature must succeed a Dexterity saving throw or it is restrained until the start of it's next turn.

Liquid. A wave of energy is unleashed throughout the surface. The creature takes 1d10 Lightning, Cold or Fire damage, depending on the liquid.

Air/Gas. A burst of air ruptures in the space. Any creature within the space takes 1d10 Thunder damage.

You can only use this feature a number of times equal to your wisdom modifier plus your proficiency bonus per long rest.