Oh boii this isn't gonna work well

One thing about this story is they are only given the power of what's within their title. I.e., gluttony rakshasa will only have the power to eat and absorb the powers of those he ate. The space rakshasa, another one of the guardians, only had the power to manipulate space, no matter how OP he was, he didn't have anything that wasn't connected to space manipulation. He's the immortal rakshasa so his power is mostly limited to being immortal, hence regenerating even from a drop of blood. The immortal rakshasa suddenly being able to warp reality despite just having the ability to be immortal, seems out of the specs of the world's rules and reality

Also, I'm pretty sure the reason why Space Rakshasa didn't confine them in the space realm because the only way to go in and out of the space realm is if the Space Rakshasa opens a portal and Jeong Ildu used to open a gate every time he would need to summon other rakshasa that he's imprisoned or when he's imprisoning other rakshasas. Just like in Han Maru's time there where he only got out because somewhere in the realm, Jeong Ildu opened up a portal to summon a rakshasa he's been keeping there. Jeong Ildu would've had to open up a portal each time he transports one of the 8 heavenly guardians or even one of the rakshasas he's imprisoned so it wouldn't have worked out as one of the 8 would've gotten out as well. That's why he only stored normal rakshasas there as they aren't that big of a threat and wouldn't likely be able to find the random portals he summons. Unlike Jeong Ildu, Han Maru wouldn't use the space realm aside from transporting this immortal rakshasa so it could be a good plan.