Quick poll: Combo Techniques/Dual Techniques. Yay or nay?
Say, for example, a combo where a fighter and a wizard act on the same initiative. The fighter shoots a nonmagical arrow and the wizard casts Fire Bolt. The target is a Red Dragon who takes half damage from fire and half damage from nonmagical weapons. If the arrow hits and the firebolt misses, the firebolt deals half damage (reduced to 1/4) while the arrow is treated as magical for the purpose of overcoming resistance. If the firebolt hits but the arrow misses both deal half damage (and the arrow is reduced to 1/4). If both hit, they ignore the dragon's resistance to either attack by combining them and maybe add some cool effect.
Or, say, putting a paladin with a magic shield in the line of a Lightning Bolt spell (or other line effect) to bounce it off the shield and let it do a sharp turn from the Paladin's square instead of going in a straight line.
Or using the Shove maneuver to give someone disadvantage on the dex save for a Fireball spell when you push them into the area of effect.
(I know I'm going hard on the martial+magic at the moment it's just where my hubby and my brains are at)
Would that hold interest?