Pirates Added A Mercenary Dialog
The pirates just exchanged one of their rubies for a mercenary player. This player will stay with the team just for this expedition. These Mercenary players are powerful, so watch out for them.
To add a mercenary player to your team press the Add Mercenary toolbar button (the button with a face on it). Mercenaries can only be added if your team has rubies. A team gets rubies by digging up treasure chests.