This command creation is fairly small so I do not expect to add much onto it. WARNING! This command requires version 15w44b or greater. If you want to get the command, go to the command section in this project.

Features:
-Works multiplayer
-Naturally generates 1 chasm every 2 days of minecraft(Soon to change time).
-You can also spawn a chasm using the provided spawn egg.

Command:
1.9-1.10: http://pastebin.com/ZUEAvSFa
1.11+: http://pastebin.com/shguTACy

Credits:
-Used MCStacker
-Used Command Combiner 1.9
-Used JSON Creator for Minecraft

Tips:
-I would recommend not using the creation much on multiplayer because of lag, but the command is compatible if you want to play multiplayer.

Updates:
*Initial Release-10/29/2015
*Fix for lava & water-10/30/2015
*Fix for obsidian-10/31/2015