I have been thinking about how we've recently got Dead Messenger. That makes three energy exotics that can change their element type. I have thought about a sword that has that perk but changes its heavy attack depending on its element. I thought vortex for void, caster for arc, and slam for solar.
Idk what it should have for a secondary perk but I think for every elemental shield that is broken with the same type it will grant a small damage buff to the sword.
If it has a catalyst, I'd say giving it stasis which it's heavy will summon a wave of stasis crystals like the Titan melee attack. But costs more ammo on heavy. Or the sword would have stasis without the catalyst and just have it grant ammo on every kill you get with a challenging enemy.
I don't know about the name but I think Threadbreaker would probably suit it. To represent our will of control when we have the darkness and dedication to the light or whatever I don't know lol.
My idea was a Pulse Rifle that change fire rate and bullet from burst based on magazine,
Exotics intrisic: this fire 4 Rounds the firth half of magazine. 3 rounds of the second half of magazine. 2 rounds on the third half of magazine.
Hammed forge rifling.
Exotic trait: kill with this weapon refill the magazine based on the rounds shooted.
It means if you kill with 3 o 2 burst rounds it refill the weapon based on the second o third half of magazine
Name it if you want