1 Time only i assume.
Because if it is repeatable.
Party of 8 will kill 50 apostle in 5 mins, each earning 10m which is 80m, do this for an hour you have 9.6GB. That will break the economy.
Farmers will be there all day everyday.
And the other part is, even if not repeatable, people will create other accounts, and have their mains do it for them. So this is a tough one.
I think this can be a good idea for higher lvl mobs. Such as DM, DS, Falc (maybe they kinda weak), TC. So it simulates the Commanders in bowl. Each gem minimum about 15m they drop quite often. But apostle/lamia etc. I will disagree.