An update that should be in Halo: 5 Guardians

*System Link
*Able to play Custom games offline
*Split screen returning
*Able to customize spartan offline
*Force (When releases able to use offline)

If i have missed anything please let me know

Pretty much everything you’ve listed is impossible to do
-forge: not done yet
-system link and Splitscreen: impossible since the engine requires 60fps to work without crashing and 60fps and Splitscreen and/or system link is impossible to do at the same time
-custom games offline: custom games work on dedicated servers, besides what’s the point using it offline? You can’t do Splitscreen and there is no custom games ai.