Arachnicid (5e Creature)
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Large monstrosity, chaotic evil
Spider Climb. The Arachnicid can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Web Sense. While in contact with a web, the Arachnicid knows the exact location of any other creature in contact with the same web.
Web Walker. The Arachnicid ignores Movement restrictions caused by webbing.
Multiattack. The Arachnicid makes three attacks, two with its claws and one with its bite.
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 7 (1d8 + 3) piercing damage plus (2d8) poison damage. The target must make a DC 13 Constitution saving throw. On a failure, if the creature is a humanoid, beast or monstrosity, they will become inflicted with Arachnomania. Symptoms will emerge 1d8 hours after being affected.
Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 7 (2d4 + 3) slashing damage. The target must make a DC 11 Constitution saving throw. On a failure, the target becomes poisoned for 1 hour.
Web (Recharge 5-6). Ranged Weapon Attack: +7 to hit, range 30/60 ft., one Large or smaller creature. Hit: The target is restrained by webbing. As an action, the restrained target can make a DC 14 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 13; 17 hit points; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).
Arachnicids are commonly associated with the Drider. Arachnids are much more violent, territorial and monstrous in nature. When one sets its mind to something, there is are very few thinks that can stop it. It runs on two simple urges, to kill and reproduce. They will fill their lairs with webbing and traps so that they may be able to capture any naive adventurers who would dare trespass in its domain. Arachnicids are created when a humanoid is infected with Arachnomania. The mutate and transform into a large, spider-like beast with very few of its humanoid features remaining. When it finds a suitable target, instead of killing them, the Arachnicid will first paralyze the target before carefully wrapping it up in webbing. It will then bite the victim and introduce Arachnomania into its body. Unlike normal Arachnomania, the transformation will take around 24 hours. If the cocoon is significantly damage or destroyed in any way, the Aracnicid will become extremely violent and seek out a new victim. If it happens to bite a creature before wrapping it up, the Arachnicid will attempt to retreat and take the victim away before wrapping it up. When the Arachnicid breaks out of their cocoon, they will have completely transformed into another Arachnicid, albiet, a bit smaller than a normal Arachnicid. The target is essentially reborn as a new being and seems to have the mental capacity of a new born. The victim may also retain some features of the gender of Arachnicid that bit it. For example if a male humanoid was bitten and transformed by a female Arachnicid, upon transformation, it becomes similar to the female, with similar breasts and increased hair length. The parent Arachnicid will raise and teach the young Arachnicid for about 1 year before the Arachnicid grows to full size and leaves to create its own lair. Arachnicids don't seem to hold any emotional attachments though, and will not hesitate to kill any Arachnicid trespassing in its lair, even if that Arachnicid used to be its young.