Twig blights

6) Twig blights rest inside the ground. When do they emerge? If the smell of blood, have a bunch of them suddenly emerge mid-battle, from anywhere on the battlefield. If it’s sensing vibrations, the players had better think twice when they step on bare earth during a battle.
7) Have the players be on a jutting-out piece of land that’s next to a cliff. T=Suddenly the twig blights emerge…. And the land gives way, causing everyone to fall. Whoops!
8) Twig blights are flammable. Why should they not keep burning after being killed by fire? Prest, mini walls of fire clogging up the battlefield. (I don’t they’d burn for more than a round, but that’s enough to be trouble.)

Vine Blights

9) The Monster Manual tells us that sometimes blights are occupying a village they recently ruined. If you break out of a tangle of plants inside a house, and the floor’s already weakened from vegetation, this could cause the floor to give way entirely.
10) The classic way to use entangle: have there be some danger that the PCs have to keep moving to avoid. This could be a fire, a pursuing swarm, or an onslaught of ranged attacks (see needle blights).
11) Have the PC slip off a cliff, and a vine blight catches him with its vine whip. How does he get free without killing himself? (The vine blight made a mistake. They’re unintelligent, anyway. Mechanically, it did it via a readied action.)