Perhaps you could consider allowing more thematic rainbow-esque mages so long as they took a certain minimum amount of their main magic path? So for example the warlock could be required to have 4-6 as a minimum blood magic amount before being allowed to take other paths. Or just require a minimum amount of main path magic in all pretenders and lift pretender restrictions altogether (though I can see how you wouldn't want to, especially after expending all that brainpower on the matter). Just a thought. Not even sure those who might want to take such a pretender would be happy with that :P Blood uses fire, water, earth, death, nature and astral in many of its spells, so blood is kind of rainbow-flavoured anyway
