Assassin talent:

Knives Everywhere
Basic: You have a collection of throwing knives. This is a ranged weapon that inflicts d4 piercing damage, and has the Finesse, Light, and Range (20/60) properties.
Improved: You can make opportunity attacks with your throwing knives. You have an effective reach of 10 feet for purposes of this opportunity attack.
Advanced: You no longer have disadvantage on attack rolls made with a throwing knife if you are within 5 feet of a hostile creature.
Mastery: (think of a benefit that makes throwing knives uber-worthwhile)

Panoply fighter talent:

Golf Bag Full of Weapons
Basic: You have a second set of readied weapons. You may spend your bonus action to switch which set of weapons you have at hand.
Improved: You have a third set of readied weapons.
Advanced: You have a fourth set of readied weapons.
Mastery: If you switch your readied weapons, you have advantage on attack rolls until the end of your current turn.