Free matrix gem or something

party took trials to try and earn a matrix gem, during the first trial they failed to fight against copies of party members that were gem empowered, during the second trial they fought hordes of undead, rewound time and were stuck in a time loop (rate burning a few times to cause and fix such), and finally took it upon themselves to do a third trial, that was a super hirudo exterminator, 4/5 characters died.