Mouser

Meant to disrupt and invade squares, assisting allies and taking advantage of enemies.

Overlooked

Lvl 3
You can use stealth behind creatures 1 size category or more larger than you, using them to hide/remain unseen.

-If the creature is an enemy you must be hidden from them before hand.
-If enemies are aware of your location you can attempt to hide behind an ally with disadvantage.
-If you are hidden, you can move up to 10 feet in the open without revealing yourself if you end the move in a position where you're not clearly visible.

Underfoot

Lvl 3
As a bonus action the Mouser can enter the square of an adjacent ally at least 1 size category larger than them.

The Mouser and the ally they share a square with gain the following benefits:
-Half cover
-Immune to flanking

As a reaction, the Mouser can enter the square of an enemy at least 1 size category larger, that misses an attack against them or an ally they share a square with. On the next turn and each after that the Mouser must use their bonus action to remain in the enemy square.

An enemy the Mouser shares a square with receives the following negatives:
-Disadvantage on dexterity saving throws
-Moving out of the square provokes an attack of opportunity from the Mouser.

The Mouser sharing the square with an enemy receives the following benefits:
-Advantage on attacks vs the enemy
-Half cover

-Enemies more than 2 size categories larger than the Mouser do not receive disadvantage on dexterity saving throws.

The bigger they are

Lvl 9
As an attack against an enemy you share a square with, you slash and rend their legs, hindering their movement.

The enemies movement speed is halved for 4 rounds and they must succeed at a constitution saving throw or fall prone. DC is 8+prof bonus+dexterity modifier

Mouser can use this ability once per short rest

This ability does not work on creatures more than 2 size categories larger than the Mouser.

Sweet spot

Lvl 13
2 sneak attack dice are max damage for creatures at least 1 size category larger. If the target is unaware of the Mouser add 1 additional dice at max damage. This feature is doubled with critical, if you are rolling additional dice on critical hits.

Master Mouser

Lvl 17

-Overlooked now allows you to hide behind creatures at least 1 size category larger even if they have seen you. The roll to hide behind a creature that has seen you is at disadvantage

-Underfoot does not require a bonus action to remain in the enemy square

-The bigger they are, can be used twice per short rest

-Sweet Spot does 4 dice at max damage and 2 additional max to unaware enemies