This is a step by step guide on how to add Bloodthirst compatibility to any custom follower/NPC in your game.
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Feel free to share my guide with others & upload on other sites so long as I'm given proper credit for writing it. Link back to the guide here on Skyrim SE Nexus. Under no circumstances can my guide be locked behind a paywall period. My guide is free to use for no charge.
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Changelogs
Version 1.0
Initial Guide Release.
Tutorial on how to add Bloodthirst compatibility to any Vampire NPC/follower in Skyrim SE:
1. Load the desired follower/NPC .esp into SSE Edit. 2. Once loaded, open the Non-Player Character Actor tab. 3. Scroll down to the Actor Effects line, right-click, select Edit & type in the following: crvampiresundamage "Weakness to Sunlight" 4. Scroll down to the Keywords line, right-click, select Edit & type in the following: ActorTypeUndead Vampire 5. Close SSE Edit, making sure the Backup Plugins checkbox is checked in case something goes wrong.
Of course, these edits will only work if one has properly ported the Bloodthirst mod from Skyrim LE Nexus over to Skyrim SE for one's own personal use.
If done properly, custom vampire followers/NPCs will behave as vampires should, sneaking around & feeding on unsuspecting NPCs/the player. As Isran would say, "Watch your back!"