Arachnid Brood Spawn

Characteristics

Web Walker. The Arachnid Brood Spawn ignores movement restrictions caused by webs.

Spider Climb. The Arachnid Brood Spawn can climb difficult surfaces, including upside down on ceilings, without needing to make an attribute check.

Mystic Opulence. This creature has the ability to evolve alongside its caster's progression. Starting at the 2nd level of a character with the Brood Mystic runessence, its spawn have a CR equal to half their caster's player level. With each CR increase, the creature gains 1 additional hit die and 1 additional damage die to its bite. In addition, upon reaching CR 2, 4, 6, 8, and 10, the creature gains +1 Strength, Dexterity (increasing its AC as the modifier rises), and Constitution (adding a fixed amount to its maximum hit points equal to the Constitution modifier multiplied by the caster's proficiency bonus), and its Web's DC increases by 1.

Web Sense. While in contact with a web, the Arachnid Brood Spawn knows the exact location of any other creature in contact with the same web.

Disposable. The Arachnid Brood Spawn takes double damage from failed-save effects or spells that aren't Dexterity-based. Even if the Arachnid Brood Spawn succeeds on a failed-save effect or spell that isn't Dexterity-based, it takes normal damage instead of just half.

Web (Recharge 6). With a bonus action, the spawn can fire a cocoon of webbing in a line up to 15 feet long that bursts on contact with the first target, who must make a DC 12 Dexterity saving throw; on a failure, they gain the Grappled condition for 1 minute, and at the start of each turn can make a new Strength saving throw with the same DC, ending the grapple on a success. The Web Cocoon can also be attacked and destroyed (AC 10; 5 hit points; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).

Attacks

Bite. Melee Natural Weapon Attack, +4 to hit, 5 ft. reach, one target. On a hit, deals 4 (1d4+2) Piercing damage.