»sky block with mods ?

the only thing that i was asking my self about is the ability of playing sky block with sky factory III mod pack

 

Sky factory is not on the approved mods list. Most of the features won’t even work; feed the beast mod packs change the game significantly, and those are client side mods which aren’t compatible with servers.

I recommend you do not attempt to use that modpack on guildcraft.

 

okay thanks for your help,now I understand why most of the famous mods aren't allowed in this server

 

Mod is allowed as long as it doesn't give you extreme advantage over other player, here are the list of allowed mod:
https://www.guildcraft.org/threads/server-rules.25/

Please understand that GC are trying their best to make the game as fair as possible, even AFK-mining is illegal now to stop [Ranked] player to have more advantage then [Member] player.