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They get multiple summons but it takes time in the roleplay to gain more summons, they start with a simple basic lowest grade elemental summon in order to keep everyone semi-balance at the start. which is your suppose to be a lowest grade wind elemental? you need to state that it's a lowest grade elemental and what element. otherwise could be seen as various types of summons.

'Master of the Skies' does that mean his Future Specialization is going to be flying/wind type summons?