Multiattack. The brachydios makes three attacks: one with its horn and two with its fist. Horn. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 20 (3d8 + 7) bludgeoning damage plus 3 (1d6) fire damage.
Fist. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 17 (3d6 + 7) bludgeoning damage. plus 3 (1d6) fire damage.
Chemical Reaction (Recharge 5-6). The brachydios slams his horn into the ground and causes a chain of explosions in a 60 foot line that is 10 feet wide. Each creature in that line must make a DC 19 Dexterity saving throw, taking 22 (5d8) fire damage plus 18 (4d8) bludgeoning damage on a failed save, or half as much damage on a successful one.
The brachydios can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creatures turn. The brachydios regains spent legendary actions at the start of its turn.
Fist Attack. The brachydios makes a fist attack.
Move. The brachydios moves up to its speed without provoking opportunity attacks.
Slam (Costs 2 Actions).* The brachydios makes a horn attack or uses its chemical reaction.
Description
Brachydios are easily identifiable by their glowing, green slime-covered horns and "fists," as well as their shiny, armored hide covered in many plates and ridges that are made of obsidian. Unlike other Brute Wyverns, Brachydios sports a pair of long, highly developed forelimbs that it uses as its primary means of defense. Brachydios' forelimbs and horn seem to secrete a mysterious slime.
A Brachydios "primes" this mucus to explode with its saliva, hence why it licks its arms, making it appear brighter green. Despite initial appearances, Brachydios does possess claws on its forearms that are tucked away underneath, and serve no apparent purpose in battle.
The symbiotic slime-mold is easily one of the most unique and defining feature of the Brachydios. The theropods armored shell is hardened to protect against the explosive blasts that the mold creates on impact. A Brachydios skin is similar to that of a thermos flask, giving it the ability to withstand both extreme heat and cold. Brachydios body is the only place this mold can survive without turning explosive. When attacking, Brachydios constantly scrapes copious amounts of this mold off of its body, causing it to deplete. However, it seems that the beast's saliva acts as a powerful stimulant, which causes the mold to almost instantly replenish itself.
Brachydios are extremely aggressive creatures and will not hesitate to attack if they feel threatened or challenged. Due to their aggression they are commonly known to invade the territories of other large predators, usurp them, and claim the territory as their own. They will also show no mercy to small monsters. Young Brachydios will live near their parents and their territory, yet the adults will not show any parental care at all. The young will pick up slime mold left behind by adults. However, this can be dangerous as their hides are underdeveloped and can possibly be seriously injured or even killed by the explosions of the slime mold.
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