Aquatic Strider
Medium construct, unaligned
Armor Class
13 (natural armor)
Hit Points
51 (6d10 + 18)
Speed
40 ft., swim 30 ft.
STR
16 (+3)
DEX
8 (-1)
CON
16 (+3)
INT
6 (-2)
WIS
10 (+0)
CHA
6 (-2)
Condition Immunities
charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses
passive Perception 10
Languages
understands Common and Aquan but can’t speak.
Challenge
2 (450 XP)
Shapeshifter. The strider can use its bonus action to transform its body into a tall, swift, four-legged construct held together by streams of water, or into a tough, slow-moving, cannon construct. While in the cannon form, the strider has its AC increased to 16 and its movement speed reduced to 20 ft. The strider falls to pieces when it dies, regardless of its current form.
Actions
Multiattack. The strider makes two attacks with its impale ability.
Impale (Strider Form Only). Melee Weapon Attack: +5 to hit, reach 5ft., one target. Hit: 7 (1d8 + 3) piercing damage.
Water Orb (Cannon Form Only). Ranged Weapon Attack: +5 to hit, range 30/90 ft., one target. Hit: 18 (4d8) cold damage and the target’s speed is reduced by 10 feet on their next turn.
Aqua Cannon (Cannon Form Only) (Recharge 6). The strider unleashes a torrent of powerful water from its cannon in a 60-foot line. Any creature in this area must make a DC 12 Dexterity saving throw, taking 7 (2d6) bludgeoning damage and 7 (2d6) cold damage and be pushed 15 feet on a failed save, or half as much damage and not pushed on a successful one. Any creatures behind the initial target hit by this ability have advantage on this saving throw.