What if there was a fifth Magical element: Astro? Here's some Astro-element monsters:

Elements: Cold, Air, Fire and ofcourse, astro!

The entire Astro Island will be based on Solar System and each of these magical monsters will represent Planets. Also, they're also based on olympian gods (for example: Meercuah's based on Hermes, due to of it's wing-like antennas).

The genre of the song will be Jungle (drum and bass)

Here's some Astro Monsters left to create:

Venus (Air + Astro) (Instrument: Bass guitar)

Saturn (Air + Fire + Astro)

The quad astro will be based on our planet: Earth.

What about pure magicals with Astro element? Well, maybe will be a new island, because I'm not sure what Star shaper say about these monsters from Magical Sanctum. I think Star shaper will be mad.

I'm not sure if my idea was original or not.

Please excuse my bad english, I'm Polish.