Take the 2-minute tour ×  In Anima: Beyond Fantasy, magic is
divided up into paths, some of which are opposed to each other.
The rules quite clearly state that it costs twice as much to
advance along a path opposed to one which a character has
mastered... But they entirely neglect to define what constitutes
mastery. (My suspicion is that something was lost in the game's
translation to English.)  A mage's progression along a path is
measured from 0-100, with a spell being learned every even-
numbered level above zero. Presumably, therefore, path level 1
wouldn't consitute mastery in any sense.  However, I very much
doubt that you have to reach level 100 to be a master, as the
high end spells of the path ('Divine magic,' in game terms) are
only usable by players with the aid of GM intervention - and the
spells a little lower-level than that are 'High Magic,' which
typically require characters to permanently give up their
humanity before being castable. Since many of the powerful mages
listed in the setting mater