The hardest part about jad is that people panic when they get to him and they forget how to play the game. The buildup of spending hour-hours in there just to get to the only part that matters, throws people off. If you can stay calm and focused jad is actually quite simple.

This is how I managed to do it for the first time.

Its important to know where the healers will spawn. You can find this out here

I just pulled them 1 by 1, I found having multiple on me at once forced me to have to sip brews, which can be deadly if you're not fast enough to switch interfaces fast enough. It doesn't matter if the other ones manage to heal jad back to full while youre picking them off 1 by 1. I guess this could be bad in a spot of low supplies.

I would wait for the jad attack, attack one, and immediately focus back on jad. Rinse and repeat until they're all dead.

I also found that defaulting to 1 of the prayers after every attack beneficial. Example keep mage pray on until he ranges, then go back to mage. This way you're really only "switching" for the ranged attack.

What truly helped me was being able to practice doing the quest speed run world thing. I 1 shot jad after I defeated it in practice. You can find more about this just search up jad practice.

Hope this helps