Sources
CR
Type
Size
Alignment
Movement

Clockwork Defender

Medium Construct, Unaligned

Armor Class 17 (natural armor)
Hit Points 42 (5d8 + 20)
Speed 30 ft.
STR
16
+3
DEX
15
+2
CON
18
+4
INT
3
-4
WIS
14
+2
CHA
1
-5
Skills Perception +6, Stealth +4
Damage Immunities poison
Condition Immunities Charmed, Exhaustion, Frightened, Paralyzed, Petrified, Poisoned
Senses passive Perception 16
Languages understands the languages of its creator but can't speak
Challenge 1 (200 XP)

Traits

Unusual Nature. The defender doesn't need air, food, drink, or sleep.

Actions

Electrified Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit:7 (1d8 + 3) piercing damage plus 7 (2d6) lightning damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be grappled (escape DC 13). A creature grappled by the defender takes the damage again at the start of each of the defender's turns. The defender can have only one creature grappled in this way at a time, and the defender can't make Electrified Bite attacks while grappling.

Bonus Actions

Light Beam. The defender emits bright light from its eyes in a 60-foot cone, or it shuts off this light.

Lore

A clockwork defender is a mechanical quadruped that vaguely resembles a hound. Its eyes glow and can project intense but harmless beams of light. It tirelessly protects whatever its creator wants, and it can be programmed by its creator not to attack certain kinds of creatures.