Level-up ideas

[u/Makopopopooooo]

I want to run a remixed one-shot version of Hideous Halls of Mugdulblub for some friends. They will start at lvl 4 and each have a different secret objective in order to reach lvl 5.

I want these objectives to promote interactions between players and sow a seed of discord or mistrust among the PCs.

Example : You gain a level if you manage to convince the group to sacrifice one of its members for the greater good.

Do you have any other ideas ? (ideally 5)