Sailing Ship

Gargantuan Vehicle (100 ft. by 20 ft.)
Creature Capacity  30 crew, 20 passengers
Cargo Capacity  100 tons
Travel Pace  5 miles per hour (120 miles per day)
Roll Initiative!  -2

STR
20  (+5)
DEX
7  (-2)
CON
17  (+3)

Damage Immunities  poison, psychic
Condition Immunities  blinded, charmed, deafened, exhaustion, frightened, incapacitated, paralyzed, petrified, poisoned, prone, stunned, unconscious
Actions
On its turn, the ship can take 3 actions, choosing from the options below. It can take only 2 actions if it has fewer than twenty crew and only 1 action if it has fewer than ten. It can't take these actions if it has fewer than three crew.
Fire Ballistas.  The ship can fire its ballista (DMG, ch. 8).
Fire Mangonel.  The galley can fire its mangonel (DMG, ch. 8).
Move.  The ship can use its helm to move with its sails.
Hull
Armor Class  15
Hit Points  300 (damage threshold 15)
Control: Helm
Armor Class  18
Hit Points  50

Move up to the speed of one of the ship's sails, with one 90-degree turn. If the helm is destroyed, the ship can't turn.
Movement: Sails
Armor Class  12
Hit Points  100; -5 ft. speed per 25 damage taken
Speed (water)  45 ft.; 15 ft. while sailing into the wind; 60 ft. while sailing with the wind
Weapon: Ballista
Armor Class  15
Hit Points  50

Ranged Weapon Attack: +6 to hit, range 120/480 ft., one target. Hit: 16 (3d10) piercing damage.

Weapon: Mangonel
Armor Class  15
Hit Points  100

Ranged Weapon Attack: +5 to hit, range 200/800 ft. (can't hit targets within 60 ft. of it), one target. Hit:27 (5d10) bludgeoning damage.