Burning weapons got me thinking again on how fire can be introduced on a battlefield.
Maybe deployable bundle of stickss that can be set on fire by a guy with a torch, and used as barriers for a certain ammount of time untill the fire goes out. Players would be able to jump over these burning obstacles if the loss of hp was justified, or wait for the bundle of sticks to stop burning, or just break the thing appart if they could afford to get exposed with the enemy on the other side.
The other main use of burning bundle of stickss would be to burn down gates and wooden doors, with steady slow damage input, as opposed to breaking them down faster with melee weapons and being exposed to ranged coming from above. Of course it would take 2 or more of these things deployed at the base of the gate to get the job done, depending on its size.