Binding roommate

[Shael]

Generally you would use Isa for this.
Keep in mind though that a binding spell doesn't protect you against breathing in smoke and stuff like that, so if that guy smokes weed in your apartment it might be better to try and move away from him asap. This stuff is really harmful even if you just passively breathe in the smoke from someone else.

 

[Ol argedco luciftias]

So I think you should actually go read the page about binding spells, which tell you all about how to do it and exactly which runes to use. With step by step instructions. Then you will know.

 

[Aquarius]

If it’s illegal to possess weed where you live you might even report him to the police.