In the very far future, I plan in having a 4th weapon, other than a gun.
My five star loadout will be like this:
Perfect Mask of Seerus
Justifier Jacket
Swiftstrike Buckler
Argent Peacemaker
Umbra Driver
Blitz Needle
[Bomb or Sword]
Med Gun Damage Trinket x2
Advice on what to get?
In general, normal damage swords function decently as utility blades. A couple that come to mind are Dread Venom Striker, Leviathan Blade, and Cold Iron Vanquisher.
A bomb utility can depend. Note that it helps to have a CTR UV on the bomb.
Vapors are usable. I have two that come to mind.
Shivermist Buster prominently comes to mind as it stops movement and makes ricochet aiming alot simpler, and make Blitzing things alot safer.
Venom Veiler acts as a force multiplier and force reducer. It boosts damage, though not very notably, and halves enemy damage that can be dealt to you. Good if you mess up somewhere, and allows you to maximize the damage you can deal.
Vortexes are great for stopping movement, but also dangerous without CTR as the Movement speed reduction means you can get into sticky situations if you arent careful about when you charge the bomb.
But pair a vortexed cluster with an AP or Blitz Charge and the damage dealt should be superb.