Add Quicksand in the north big desert. Players will start to sink and move slower and slower until they sink and drown to their death in sand.
If players use some kind of tool or equipment for example a rope with a metal hook they could try to use it to get up. Put rope with hook in hotbar, equip it and press left mouse to try throw it and attatch. Then hold in mouse to drag your self up.
Or other players could use a rope to help you up from the quick sand.
Quicksand in the desert youtube movie clip: https://www.youtube.com/watch?v=FrLba1rE4sY