I go to the MAxos Temple when I was already level 12 or 14 I remeber! If you can handle the guards by the entrance of the Maxos Temple without to much trouble you're for sure ready to go in this Temple
On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin, it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !