One thing I found in Skyrim was being able to master vampire abilities while in my normal form. I was going for an assassin at the time with twin daggers with the same enchantment on them. I turned into a vampire lord on accident and turned right back. I noticed one of my daggers was missing, and in my other hand, the vampire lord drain spell. I started using it and got perks for my vampire lord tree. If I ever replaced the spell, I would just replace the daggers and repeat the process. That's when my assassin run ended, and my vampire lord run began. Just stay away from Serana she nerfs your spell.
One thing I found in Skyrim was being able to master vampire abilities while in my normal form. I was going for an assassin at the time with twin daggers with the same enchantment on them. I turned into a vampire lord on accident and turned right back. I noticed one of my daggers was missing, and in my other hand, the vampire lord drain spell. I started using it and got perks for my vampire lord tree. If I ever replaced the spell, I would just replace the daggers and repeat the process. That's when my assassin run ended, and my vampire lord run began. Just stay away from Serana she nerfs your spell.