Fey Ancestry. Oak has advantage on saving throws against being charmed, and magic can't put him to sleep.
Keen Hearing and Sight. Oak has advantage on Wisdom (Perception) checks that rely on hearing or sight.
Multiattack. Oak makes three attacks with his hooked daggers or his hand crossbow.
Hooked Dagger. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit:5 (1d4 + 3) piercing damage.
Hand Crossbow. Ranged Weapon Attack: +5 to hit, range 30/120 ft., one target. Hit:6 (1d6 + 3) piercing damage.
Return the Favor (3/Day). When Oak takes damage from a melee weapon attack, he can make a hooked dagger attack.
Oak Truestrike is the "B" Team's decisionist-and, depending on who you talk to, a reincarnated demigod. (It's a long story.) Those who know him acknowledge his confidence, his arrogance, and his odd ability to engage with others by somehow saying exactly what each listener wants to hear. Whether this is some subtle magical ability or simply grifter's charm, he makes good use of it either way.