This is a spell I have found on this site, that I have tried and it has worked succesfully.
Here it is:
"By the dragons light,
On this (month) night,
I call to thee to give me your might,
By the power of three,
I conjure thee,
To protect all that,
So mote it be,
So mote it be!!!"
Be sure to thank Espiri, the creator of this spell.
I really don't know what kind of chant you wished for, so forgive me if this is not to your liking.