Good morning Nuke, For many pets there is a order one must follow to insure things don't get messed up.. for the build you seek you can add either or and it will be fine.. as P breath is a aoe move.. and V. bite is a special ability...then you just turn the magery into mage mastery.. be aware that since magery is already loaded on the pet you are only allowed 2 more combination adds to the lore page.. so if you add those 2 you will not be able to add armor ignore.. but between the aoe,then melee aoe,and the passive he should be melting faces for sure... I would still try it on test and see if you like it.. Just alittle insight on pets for ya right fast.. pets can have any combination of the 1 aoe move,1 special ability, 2 special moves, and one school of magic.. for pets like the new Triton(about to be released) which are blank slates move wise(healing skill doesn't count toward the 3 moves limit) You can add any combination of those before listed moves like 1 aoe,1 special ability1 special move and then a school of magic to make the most of it...so long as they = the 3 then you add a magic school ,it will all fit.. for pets like the bane dragon.. magery has already been added.. because of this it effectly eats one of the 3 combo spot.. so now you have a choice of just 2 moves.. be it an aoe( poison breath),a special ability(V. bite), or special move(armor ignore) adding a new school of magic removes the old one so turning on mage mastery will just remove the old magery and replace it with mage mastery.(you can also change it to chiv,spell weaving,etc).
Just because its a pet many use.. for pets like a mare it comes pre loaded with 2 Ui moves.. the magery takes up one slot choice and breath is a special ability and since you can only have one of those it means you cant pick another.. so in the case of mares you can add only 1 move.. be it aoe, or special move.... you can also change its school of magic to mage mastery , chiv etc.. but never poison as this turns off magery and makes it a pure melee pet.. I hope this helps mate.. if you have anymore questions feel free to post here or message me.. until then have a delightful day.. =^-^=