The Quintet of One

Here's something that just popped into my head and I worked. Tell me what you think?

Seraface burns;
Mysticen freezes;
Trel creates illusions.

Then there is Ster,
Known as the dark one,
Tainted yet full of light.

Together here,
Each is part of one;
On them does he depend.

The key he is,
Their body is his,
Yet all need be to live.

Young Arna strong;
Elder Arna wise;
Corastac acts the child;
And Falagoth blunt and cold;
The key decides with their advice,
All the decisions in all their life.