The sky flashes.
Suddenly the Heaven cracks wide open and 2 HUGE(tm) trombones emerge from the
sky, playing praise song for the mighty heroes.. the Tiamat slayers!
The Last Incarnation of Tiamat is dead.

In a flash, a hole opens in the ground
it leads down...into a dark tunnel...
A familiar voice echoes in your head 'Is this the end...or just the
beginning?'
Amd utters a prayer for the fallen foe 'In nomine Faerwon. Amen.'
You hear the horrendous death-cry of the Tiamat as it dies.
Tiamat is DEAD, R.I.P.

I was playing someone else when it died.