Dementors feeding on my soul
A black fiendish ghoul

All the nightmares flow
Till I see a wand glow

(Expecto Patronum!)

A blue misty mare
shot out of nowhere.

The Abraxen winged horse
Hit with such force

It made the dementors flee
The horse still galloped with glee

It galloped and neighed
While the nightmares did fade

Till it faded into the misty night
After giving such a hard fight