monster

Ruin Spider

CR 5

Large Monstrosity, Unaligned

Reveal Stat Block

Armor Class

16 (natural armor)

Hit Points

105 (14d10 + 28)

Speed

40 ft., climb 40 ft.

str

dex

con

int

-4

wis

cha

-3

Traits

Ruinous Acid.Any nonmagical weapon that hits the spider corrodes. After dealing damage, the weapon takes a permanent and cumulative -1 penalty to damage rolls. If its penalty drops to -5, the weapon is destroyed. Nonmagical ammunition made of metal that hits the spider is destroyed after dealing damage.

Spider Climb.The spider 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 spider knows the exact location of any other creature in contact with the same web.

Web Walker.The spider ignores movement restrictions caused by webbing.

Actions

Multiattack.The spider makes two Ruinous Bite attacks. It can replace one attack with a use of Web.

Ruinous Bite.mw 7 to hit, reach 5 ft., one target. ({@damage 1d8 + 4) piercing damage and 9 (2d8) acid damage. In addition, if the target is a creature wearing nonmagical armor, the armor takes a permanent and cumulative -1 penalty to the AC it offers. Armor reduced to an Armor Class of 10 is destroyed.

Web 5.rw 7 to hit, range 30/60 ft., one creature. target has the {@condition restrained condition. As an action, a restrained target can make a 13 Strength check, bursting the webbing on a successful check. The webbing can also be destroyed (AC 10; 5 hit points; vulnerability to fire damage; immunity to acid, bludgeoning, poison, and psychic damage).

Ruin Spider

The potent magic of a Deck of Many Things can have unpredictable effects on its environment, especially when the deck remains in one place for a long time.

Ruin spiders arise when the magic of the deck transforms giant spiders into even more dangerous monsters whose acidic venom disintegrates everything it touches. A ruin spider is easily recognizable by anyone familiar with the Deck of Many Things because the pattern on the back of the cards is duplicated on the spider's carapace.