This mod includes 1 katana and 2 left-handed scabbard armors (with/without the katana inside, just to make it looks like you hold the scabbard to the left hand). However, currently you need to equip the scabbard manually, and I can do nothing about that without the GECK.
PS: the over-power damage version can be obtained from upgrading exist one in the weapon workbench with 10,000 crystal.
1) use the latest-version NMM , or download manually
2) activating the mod in NMM or extracting the archive to the FO4 data folder if manually.
3) remember to update your fallout.ini to read customized content
(for example: sResourceDataDirsFinal=STRINGS\, TEXTURES\, MUSIC\, SOUND\, INTERFACE\, MESHES\, PROGRAMS\, MATERIALS\, LODSETTINGS\, VIS\, MISC\, SCRIPTS\, SHADERSFX\ )
PS1: there is a good tutorial about FO4 mod installation, checking it if you don’t know how.
Credits: invalidfate the porting - InsanitySorrow the skyrim originate
File Details:4,1 MB / ZIP Download Fallout 4 – Insanitys Celtic Katana - Modsup.com