Bugbear Gloomstalker Assassin

Initiative. +6

Brute. A melee weapon deals one extra die of its damage when the bugbear hits with it (included in the attack).

Thrown Weapon Fighting. The bugbear can draw a weapon that has the thrown property as part of the attack it makes with the weapon. In addition, it gains a +2 bonus to the damage roll. 

Long-Limbed. The bugbear has an additional 5 ft. reach for melee weapon attacks. 

Fey Ancestry. The bugbear has advantage on saving throws made to avoid or end the charmed condition. 

Surprise Attack. If the bugbear hits a creature with an attack roll, the creature takes an extra 7 (2d6) damage if it hasn't taken a turn yet in the current combat. 

Dread Ambusher. At the start of it's first turn of combat, the bugbear's walking speed increases by 10 ft., which lasts until the end of that turn. If it takes the Attack action on that turn, it can make one additional weapon attack as part of that action, dealing an extra 1d8 damage of the weapon's damage type on a hit. 

Sneak Attack. Once per turn, it can deal an extra 2d6 damage to a creature it hit with an attack roll with a finesse or ranged weapon if it has advantage on the attack roll. It doesn't need advantage on the attack roll if another enemy of the target is within 5 ft. of it, that enemy isn't incapacitated, and it doesn't have disadvantage on the attack roll. 

Assassinate. It has advantage on attack rolls against any creature that hasn't taken a turn in combat yet, and any hit you score against a creature that is surprised is a critical hit. 

Multiattack. The bugbear makes two melee attacks.

Dagger. Melee or Ranged Weapon Attack: +7 to hit, reach 10 ft. or range 20/60 ft., one target. Hit: 9 (2d4 + 4) piercing damage in melee or 8 (1d4 + 6) piercing damage at range.

Shortbow. Ranged Weapon Attack: +7 to hit.  Range 30/120 ft., one target. Hit:  7 (1d6 + 4) piercing damage at range.

Spellcasting. The bugbear is a  spellcaster that uses Wisdom as its spellcasting ability (spell save DC 13; +5 to hit with spell attacks). It knows the following spells from the ranger's spell list:

1st Level (4 slots): goodberry, hunter's mark

2nd Level (2 slots): pass without trace, rope trick