For those who found Serana as a follower, rather weak.
Now you will see an increase in power, yet is only the beginning, soon will bring updates ...
Some things she can do now: summon gargoyle, drain life style Harkon (without transformation VL) ... I added it also shout the drain vitality, but have not had time to know if it worked; it does not uses elven dagger, is now Dragonbone dagger.

Incompatibility:
*Never

Recommends:

UFO - Ultimate Follower Overhaul or
Amazing Follower Tweaks

My other mod:

Cyrus Delvin Follower

Benjamin Taylor Follower

Hestla Merchant Upgrade

DRAGONBORN ENB