(this is in no way intended to be balanced, and is more a shitpost to use in dnd campaigns with my friends that i wanted to share) They are 2 tarrasques, with boosted stats, along with "bros attacks". Their stats individually, are the same, aside from having 20 dexterity, and intelligence. the bros. attacks take up both of their turns entirely, but deal can deal 3x damage (multiply rolled damage by 3). Each attack has different chances and possibilities of self damage. bounce bros has highest failure chance, but lowest self damage chance, and uses the claw attack as a base. swing bros is the opposite, and has guaranteed self damage, whether it succeeds or not, and uses the tail attack as a base. finally, it has chopper bros, which also uses the claw as a base, but has minimal failure chance, and only deals 1.5 times damage.
They speak Italian. (irl Italian, not a dnd equivalent)
They came into existence after a necromancer tried to bring the fallen tarrasque back to life, only to somehow, some way, duplicate them. They were intelligent, and promptly ran off. when they were next seen, they were wearing mario and luigi caps, and were promptly labled "tarrasquio and tarrasquigi"
the encounter with them is in like a sewer or water treatment plant where they're coming out of large water pipes and have party roll to see where they will come out from.
the sewer has a bunch of mushrooms that they use to feed, give them health or power ups (id make it like a d100 table and give it random effects for like a turn or 2. Grow larger changing sides, levitation ect). Party will need to either destroy the mushroom patches to stop them from healing or stop effects.
they can turn into super tarrasquio brothers with the chaos emeralds
When you're asleep, tarrasquigi can use "tarrasquiginary attacks" to attack you in your dreams. just tarrasquigi, tarrasquio cannot do that.
They run a hotel called "hotel tarrasquio"