code/modules/multiz/level_data.dm 
| /proc/get_transition_edge_turfs | Returns all the turfs within a zlevel's transition edge, on a given direction. If include corners is true, the corners of the map will be included. |
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| /proc/get_transition_edge_corner_turfs | Returns all the turfs from all 4 corners of the transition border of a level. |
| /datum/level_data | Keeps details on how to generate, maintain and access a zlevel. |
| /obj/abstract/level_data_spawner | Mapper helper for spawning a specific level_data datum with the map as it gets loaded |