Myrrh Drops are a currency in Skyforge. You can currently obtain them by donating credits to your Pantheon. You will get 1 Myrrh Drop for every 7500 credits donated if you are a Premium User. For a regular account the exchange rate is 1 Myrrh Drop for every 10000 credits.
The daily adventure must be completed with atleast 1 player from your Pantheon (without players that are not in it) on any difficulty, ie speedrunning adventures with Myrrh bonuses will work.