Grammar check on first paragraph:
The first 3 battle sprites, Drakon, Seraphynx, and Maskeraith, are known as "starter sprites". They can be obtained via the mission "#-# An Eternal Bond" and are permanently bound to you.
Also, if I were referring to this guide, it'd be better to have an introduction, overview (skill points obtained at each heat level, fed at the lab, etc.), then one section for each sprite detailing abilities and so on and so forth, and finally perks.
Finally somebody does this.
For Maskraith disadvantages, say that poison does no direct damage, unlike fire from Drakon, and the cloak/defense boost ends when you make an action other than talk and moving. So if you think about it, Maskraith is a jack of all trades, master of none.