To cast a spell pay the magicka cost, if the spell is known or you have the spells focus the spells goes off following normal spellcasting rules. Otherwise you may either preform a ritual to cast the spell or take the magicka cost as magicka burn. If you preform a ritual follow the ritual rules below. If you cast the spell taking magicka burn you must make a will save DC 15 + spell level, on failed save the spell fails and you take hit point damage equal to the magicka burn. This damage cannot be mitigated.
Am I correct in interpreting this to mean that even if you don't have the focus/ritual for the spell, you're still able to cast it if you can take the save/burn? Because that seems really strong, even for Mythos.