I was thinking that it might be neat to have a raid, in like tunnels or something, where you're constantly getting pushed forward. (Wall closing in, or a monster that will one shot wipe youre party if you're too slow)

Mobs have lots of HP, like mini bosses, you fight them one at a time, or in small groups. They're difficult, time consuming and if you try to run past tehm they AoE stun/gravity/bind you're party and wreak havoc.

Even make it so each step moving forward is weak to a different job, or resistant to others, that way people will want to mix it up.

Thought came to me, sounded neat, though I'd share.