altek's power

this is so cool

Needs way more specifics as it stands this an awful 9th level spell 5d6?

Just some constructive criticism:

Honestly, I would change the casting time to 1 Action. 10 Actions a) doesn't make sense, as this is clearly a spell designed to be cast during combat, and b) is just ... 1 minute. There is no reason to word the casting time as 10 Actions, even if that's how long you want it to take to cast.

Based on the spell description you gave, which definitely needs to be reworded to be more clear and mechanically descriptive, the duration of the spell should be instantaneous instead of untill dispelled. 

Here's an example of such a rewrite, making sure to have a focus on what mechanically happens when the spell is cast:

You summon 3 + 1d4 swarms of flying monsters from the plane known as Altek. Each of these swarms will hit a creature of your choice within range, dealing 10d6 force damage, before dissappearing. If this damage reduces the target to 0 hit points, it is disintegrated. All of the swarms can strike simultaneously and you can direct the swarms to all hit one target or several.

Best of luck with your homebrewing! :)