There are no much rules but I just want to be sure
1. Speak only English.
2. Don't use words like f*** or s*** too much, I know it can't be avoided sometimes but keep in mind that some players may have you on speakers.
3. There is no talk on boss, unless what you want to say is of great importance to encounter. Basically it means no trash talk ( what a ugly boss/see my DPSing nooobs ) at boss.
4. During trash feel free to share with us your opinions about anything you want if it is not against guild rules.
5. Last thing is connected to the quality of sound on TS3, as for some of us it may be lower than for the others don't shout over other people speaking and wait until silent so all can clear you properly.