I'll go with Kjata.

Forever forzen in endless sleep (materia state - sleeping forest)
Glow from the earth holding me (forest - earth)
A cause of destruction and disease (it bangs stuff up)
A World of blue shealters me (forest is kinda bluish when asleep)
The elements make up everythig (it's a composite of elements)
At first you may pay me no mind (it looks like a leaf at first, inconspicuous)
But I shall become yours in due time (finishes off the rhyme )