How could I cast a spell with a fatigue value above 200 like Master Enslave (it requires astral 8 and 8 astral gems but makes 800 fatigue points) ?
there is no damage involved when casting a spell over 200 fatigue (for Master Enslave for exemple, you get 200 fat, not 800) if you have the required level. If you don’t have the required level, you can do a Communion or a Sabbath and redirect the fatigue to the slaves, or spend additional gems (i.e. in addition to the spell cost and to the gem used to gain one level if necessary). Every additional gem decreases fatigue as if the mage had one more level in this school. A level 10 astral mage casting Master Enslave with 10 astral pearls (he then temporary reaches level 12, thanks to the 2 additional gems he spent), so the fatigue is divided by 5 (the mage has now 4 levels beyond spell requirement), will have 800/5 or 160 fatigue (+ enc.). A level 8 astral mage with 8 pearls can cast the spell too but will reach 200 fat (the maximum). They are both stunned but stay alive (unless they get additional fatigue afterwards, form Rigor Mortis, Sleep, etc). Keep in mind that the temporary higher