Talk:Hibernation Cave/@comment-128.232.247.69-20120301170844/@comment-4159143-20120305194927

You get an extra 25 slots for 50 gems, then an extra 50 slots for 100 gems, giving you a total of 75 extra slots for 150 gems. They are this price because this is a fairly clever little building. When trying to level up your shrines, if you hatch a Dragon you already have and want to sell it, just put one Dragon with your new Dragon's element into the cave, then place your new Dragon into a habitat, level it to level 10, then sell it, the shrines count Dragons of that element even after you sell them!