Damage over time
Includes forms of damage that applies itself over time rather than instantly, commonly caused by burning, acid, poison, and so forth. Not including pulsing damage sources that cease as soon as you go away from their area of effect.
Alternate name: DOT
The first video game about Damage over time was released on June 20, 1997.
Note that this does not include things that create areas that damage anyone who stay or move through those areas nor pre-existing such areas (e.g. lava pool or room filled with harmful gas).