It Ends With a Grave

You are a great and terrible lich. 

You have scorched your name into the ruined wastes that used to be the homes of those who have wronged you, so all would know whose wrath was incurred.

You also have an aging dog.

And her 12th birthday is coming up soon. Although you have existed for years untold without her, now facing the long stretch of eternity alone feels unimaginable.

Nobody has yet perfected a means by which to make a dog immortal, but you aim to be the first.