Static Root Blues
The lick as I have written it out here is real simple, but it's a much bigger concept and so after you have figured out the riff as shown below I would strongly encourage you to explore the idea and try and play all sorts of stuff with that top root going as well.
Using the hybrid picking is fun too if you have not done it before and it doesn't matter which finger you use to play the static root. Also works with fingerstyle of course!
Most of the great blues masters use this concept, right back from Robert Johnson, to SRV right up to present day dudes like Joe Bonamassa - it's a great one to get into your vocabulary!