Yes but when I try to enter the core it says I can't enter because of the radiation and sends me to
Viewing post in Lust Odyssey (NSFW Visual Novel) comments
sends you to what? By the way if you can't enter the core follow this.
Check first your inventory if you have the pure crystal (I think the core scientist will give you 11-12 of the crystal if you haven't noticed on your run) (Those crystals acts as a lure for the first time if first clicking the sub-guh'nir's den)
Enter the subguhnir's den. The first time it will lure the sub-guh'nir and eat the crystal (as the demo of the lure).
After that, fight subguhnir's on the Sub'Guh-Nir's Den 10 more times and in the eleventh time you click the den (the mc comments). Then, the illustration of the sub-guh'nir alpha is shown (if it did) then proceed to Galliano, as he will give you equipment and grenades then go back to the den again to either kill or (spoiler: hire it after the defeat of the...) (sub-guh'nir alpha)