You can have fiendish creatures as minions.<br/><br/>Anyway what comes to half-fiend minotaur vampire; he is not a 'true' outsider before it become vampire. It needed to sleep, eat/drink and breathe and so on. So native outsider does not count but I can allow you have half-fiend vampires or even half-celestial if you feel wicked.<br/><br/>Anyways spawn wise use normal stat array and take stats if possible directly from the book (and if creating PC classed minion then you can apply each 4th stat dot anywhere you like). Also true there is no spawn limit but I want limit how many controlled spawns you have or else everyone grabs something which allows them create spawns (to have infinate army). Vampire spawns for vampire lord who is unique devil (who is not undead) is useful as they can do things where demon/devil would stand out.