I don't own any DM screens but I assume it's the same table in DMG chapter 8. It just helps you gauge how deadly a certain amount of damage would be at different level ranges. E.g. If you decide a trap deals 4d10 damage for whatever reason, be aware that could easily kill characters between 1st and 4th level.
Most dm screens have this chart and I don’t really understand it’s use
More Interesting Lock Picking Rules
I don't own any DM screens but I assume it's the same table in DMG chapter 8. It just helps you gauge how deadly a certain amount of damage would be at different level ranges. E.g. If you decide a trap deals 4d10 damage for whatever reason, be aware that could easily kill characters between 1st and 4th level.
The Forum Infestation (TM)
It is for improvising damage. Be it from a quickly thought of trap, environmental hazard, or some non-typical strategy like collapsing a roof.
It can be a little overly deadly for characters at the low end of the level range though.