This is my first lightsaber mod, and knowing me, it had to be a complicated one...
You've probably seen The Force Awakens at this point, and Kylo Ren's unique lightsaber as well. The saber features crossguard blades that serve a defensive purpose as well as venting extra heat. Now, you can play through Knights of the Old Republic wielding crossguard lightsabers as your own! This mod adds crossguard lightsabers complete with animations, plus Kylo Ren's lightsaber, to Knights of the Old Republic.
Each of the regular crossguard lightsabers is completely upgradeable. Kylo Ren's lightsaber is not upgradeable, but features animated blade textures to give it the unstable plasma look as seen the The Force Awakens.
Due to the unique way that Knights of the Old Republic handles lightsabers, to make the lightsabers upgradeable, this mod adds an emitter item which can be bonded with any of the default lightsaber color crystals in the game. Once you have an emitter and a lightsaber color crystal, talk to T3 who can bond them together to give you the new crystal bonded to the emitter. Simply install the new bonded crystal in a single-bladed regular lightsaber, and you now have a Crossguard Lightsaber! The bonded crystals can also be used in double-bladed or short lightsabers, however, they will still be the default double-bladed and short bladed lightsabers. If you want to remove a crystal from an emitter, talk to T3 once more and he will separate the two items.
You can get crossguard lightsabers in the following locations:
Dantooine: Blue crossguard lightsaber on Nemo's body
Kashyyyk: Jolee now comes equipped with a violet crossguard lightsaber
Korriban: Sith lightsaber located in Naga Sadow's tomb has been changed to Kylo Ren's lightsaber, emitter in Marka Ragnos's tomb
Tatooine: Emitter in Krayt Dragon cave
Unknown World: Emitter on The One's body
Yavin Station: Suvam Tam will sell you 2 emitters (1 in each of his 2nd and 3rd inventory iterations, available after Leviathan)