This mod uses the high poly head from this mod: Kassandra - High Poly Racemenu Preset (Imperial and Nord) to add a marriageable Imperial follower named Kassandra inspired by the mighty hero in Assassin's Creed: Odyssey. No custom body mesh or skin texture is used, so feel free to customize her to your liking. Her weight is set to 50 by default.

I also made a Lydia replacer version.

She's a dual wielder and an expert in OneHanded, LightArmor, and Sneak.

Here's her stats.

 Flags: Essential
 Level Cap: 100
 Weight: 50
 Default Equipment: Nordic sword + Steel dagger
 Default Outfit: Imperial light armor set
 Combat Style: DLC2dunKolbjornRalisCS (Ralis's style)
 Class: Spartan (original class)
 Perks: 19 perks including "Eagle Eye"(totally ineffective for an NPC)

Maybe I made her a bit too strong. Edit her status with CK or SSEEdit (zEdit) as you like!

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Requirements:

1. DLC: Dragonborn

2. High Poly Head 1.4 (Offsite)

3. Unofficial Skyrim Special Edition Patch (required only for the Lydia replacer version)

4. KS Hairdos SSE

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Installation:

Use your mod manager to install. Both versions are safe to install mid-game.

As for the Lydia replacer version, you need to adjust Lydia's weight to 50 after mid-game installation. In order to do that, you have to open the console window and execute the commands below in succession.

1. prid A2C94
2. setnpcweight 50
3. disable
4. enable

Your Lydia is now a little slimmer and the neck seam should be gone.

If you install the Lydia replacer version on an existing save in which Lydia's level is already too high, some of her skills might not grow as high as they would in the case of starting anew after the mod installation: I haven't checked.

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Location:

She's hanging around inside Sleeping Giant Inn.

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Compatibility:

The Lydia replacer makes changes to Lydia's records, so it's not compatible with other mods that change them. You can create patches with CreationKit or SSEEdit (zEdit) to fix compatibility issues.

I made an ESL-flagged patch for Improved Follower Dialogue - Lydia. It's in the "OPTIONAL FILES" section.

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Recommended Mods:

1. Broken Spear of Heroes

2. Imperial Tribune Armor (BodySlide files: Imperial Tribune - 3BA - BHUNP - CBBE - HIMBO - UUNP)

3. Moderately Built - BodySlide Preset BHUNP

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Appendix:

1. Skin texture used in screenshots: Leyenda Skin

2. 3BA version with an improved face and original equipment: Kassandra - Hiph Poly Follower 3BA - ESPFE