Because I am limited on time, for now, I'll give you more in depth descriptions of the Exburnans and Melonians here, but I'll move them to an appropriate forum once I make it.
Both creatures will appear in flashes of lightening and only during storms. Both use the same language as each other and both can understand human language, but they prefer to use their own, making them seem like monsters. They both are quite smart, and quite monstrous as well. Both have the ability to generate lightning in some way.
ExburnansExburnans are about the same size as humans. They are able to generate electricity from clouds and discharge it as lightening bolts, making them very dangerous. Also, they tend to drain the energy of those they attack. They are also sometimes known to be stealthy, which they use to secretly cause problems to machines such as engines. They feed off of both magical energy and electricity.
MeloniansThese creatures prefer more warmer climates and are slightly larger. They are more knowledgeable in combat, and are slightly larger. They use the assistance of a varaity of fabricated weapons that shoot many things including lightning bolts, ball lightning, hornets, spikes, acid, fire, anything. One can take down an entire unarmed crew in less than ten minutes. It isn't effected by electricity or heat.