The description for Rihana's Item Mustafa's Lodestone reads:
"This lodestone will help guide you through storms, but Mustafa was a tricksy fellow. You can be sure there's a downside as well."

Said downside, to my knowledge, never manifested in the nearly 5 years' worth I played and "won" with Rihana. Have the designers really left a loose thread that leads nowhere? The earlier forum--which is extremely helpful in many respects--seems to have concluded so, but this was never a primary topic, just mentioned in passing.