Spinaculus

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Original monster design for dnd:
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SPINACULUS
Small Construct
Alignment: Same as its creator (usually Neutral)
Challenge rating: 3
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"A small, misshapen being stands before you, a weapon clutched tightly in its large hands. Its bulbous head is disproportionately large, its limbs are long and boney, and numerous vials and bottles appear to be embedded in its hunched back. Inside these flasks, connected by tubes, float colored liquids that give off a chemical odor. When looking closer, you notice small spines covering its skin, and weird compound eyes."
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Spinaculi are more offensive versions of classic homunculi. Unlike ordinary homunculi they do not have wings but flasks filled with alchemical substances instead, and their bodies are covered in venomous spines. Like their cousins, their bite is also poisonous. Their strange eyes grant them night vision, darkvision, and invisibility detection. They measure slithly more than 2,5 ft. but weigh almost 90 pounds, due to the concoctions they carry. They do not speak, but obey any verbal or telepathic commands from their masters.
These swift servants are often equipped with rudimentary weapons and rush into close combat against their opponents, while their magician masters cast spells from a distance. Any attack on a spinaculus has a chance of shattering one of the vials on its back, causing acid damage, and any contact with its skin exposes the attacker to its piercing stingers and their venom. The spinaculus, for its part, is immune to acid and poison. When that creature dies, it explodes violently and ignites the concoctions on its back: the resulting impact is a motley mix of poisoned darts, shards of sharp glass, flames, and acid, covering 10 ft. in diameter. Their creator usually doesn't hesitate to sacrifice it during battle, when it appears agonizing.
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A single spinaculus is often nothing more than a menacing nuisance, but they can cause terrible damage when deployed by dozens. Easy to make, they are produced in large quantities in guilds and schools of magic, whose members use them as sentries and shock troops.
Although this theory is rejected by most wizards, some historians believe that the first spinaculi were the result of a hybridization between spined devils (spinagons) and mane demons. The former's barbs and name, and the latter's self-destructive capacity, are the main—and usually only—arguments put forward to lend credibility to this hypothesis. Scholars who support this idea worry about the effects such a fiendish origin could have on these creations, and fear that they might become evil in the future. Most intellectuals, however, relegate these beliefs to the rank of lucubrations.