I am unclear if this requires a regular stanza poem or a haiku, I have provided both, with the stanza poem being my submission if the bit about a haiku wasn't making it required.

Haiku:
Cold fire within
Betrayer looms in shadows
Wrath not yet sated

Regular Stanza Poem:
It should have been expected, to trust and be betrayed
I should have seen it coming, but my mind was far too pained.
The selfish Dragon did as needed, for Arcona to be saved,
I understand but don't forgive, Krath's vengeance must be sated.

A murder most foul.
This betrayal unforeseen.
I'm slain with a scowl.

Questions unanswered,
Last seen, this life unfulfilled,
Magic fades, darkness.

I don't feel a thing
Anger left me long ago
No fear or regret

The burning of guts,
Both physical and mental,
Our mission betrayed.