Generic, Text: Bog/Quicksand/Quickslush

10 ft. square. Characters can jump feet = to strength score.
10 ft. deep. When creatures enter the area they sink 1d4+1 feet & become restrained.
At start of each turn creatures sink another 1d4 feet.
Strength ability check DC 10 to escape.
If creatures outside the hazard tries to pull a restrained creature free they make a Strength ability check DC 5+feet sunk.
If fully submerged creatures can hold breath for minutes = 1+Constitution modifier, then they start choking for rounds = to Constitution modifier, then 0 HP & dying until air is available or dead.