although it may help to have a maxed (331 attack) launcher with tracking, not mandatory. although it may help to have a team full of 32s, not mandatory. completed the raid on hard with a team of random lvls (lvls 30,31,32). when inviting people to do raids through site like destiny tracker the only requirements I ask for are that you have semi-decent weapons (no NLB and 4th horseman), to no join us in orbit if they are not lvl 30 (I've had a fair share of people joining and claiming they completed HM as lvl 29) and to have fun. with that said, having a ghorn is nice, and useful, and withing a skilled player the raid is done with 2 people with moderate coordination.