Carbuncle is available from level 4 as a Arcanist. There are two summons available to the arcanist, using the skills Summon and Summon II. Summon will create a Emerald Carbuncle who is a caster pet. Summon II will create a Topaz Carbuncle, which is a tank pet. Once an Arcanist assumes either the Summoner or Scholar job, the same skills will summon different pets.