how much gygabytes does realm of magic take up

@roxitylol22  ROM is 932.5 MB in macOS.  However, if you only have 6 GB free on your Mac, you're going to run into trouble sooner rather than later.  Even casual use requires some free space, and running a game requires more, both for performance reasons and and, in more dire situations, to allow apps to run at all.

So I'd suggest freeing up at least another 10 GB, preferably more like 20 if possible.  Check the Downloads folder for old files you no longer need, and be sure to empty the trash.