Escape the Horde Saarvith can use the Disengage or Hide
action as a bonus action on his turn and opportunity attacks
are made at a disadvantage.

Natural Explorer Saarvith gets advantage on attacks against foes who haven't acted yet in the first round of combat, as well as advantage on Initiative checks and the
ability to ignore difficult terrain.

Fighting Style Archery adds +2 to all ranged weapon attacks rolls

Colossus Slayer once per turn Saarvith may deal an additional 1d8 damage to a creature already below its hit point maximum.

Spellcasting Saarvith is a 7th level spellcaster. His spellcasting ability is Wisdom
(Spell save DC 14) (Spell attack to hit +5) Saarvith knows the following ranger
spells:
1st level (4 slots): hunter's mark , longstrider 
2nd level (3 slots): pass without trace , protection from poison , silence 

Multiattack Saarvith makes two attacks.

Greatsword +1 Melee Weapon Attack. 5 ft. reach, one target.
 ∎ To Hit: +5
 ∎ Damage: 2d6+1 Slashing

Longbow +1 Ranged Weapon Attack. Range 150/600, one target
 ∎ To Hit: +10
 ∎ Damage: 2d6+1 Piercing damage
 ∎ He might also use some of his +1 arrows (he has 10) (+1 to hit, +1 damage).