The beast planet has no weaknesses depicted during the show and thus often get brought up in powerlevel debates or in /tg/ threads as a trump card. It's one of the few things that can easily handle everything the 40k Universe can throw at it.
In most series, the big bad always has at least one exploitable weakness that allows the good guys to win. Shadow Raider was cancelled before the beast could be properly defeated so the only method of 'defeating' it is to stall / run away indefinitely.>>102617048
In the show too, Planet Water turned itself into a massive weapon to attempt to defeat the Beast, but it did nothing.>>102617011
Well, she's essentially naked.
It does say she crashed there, but she might have crashed there while the Prison Planet was a part of the Cluster.
I read a theory once that she was a Rock/Ice hybrid, but I much prefer the 'Planet Crystal' survivor theory.