Rental NPC allows characters to rent falcons, carts, and peco pecos. Characters must meet certain requirements in order to qualify for rentals, depending on the item for rent.
In most servers, only Hunters can rent falcons, but in ExperienceRO, there's an exception to this rule. In eRO, wearing True Ring of Visibillity enables its wearer to rent a falcon. The falcon sprite depends on the renter's job class or the job class of his/her suit.
As for the rental of Peco Pecos, it is currently only restricted to the Swordsman class, although other classes can still have mounts when wearing a Ring of a Rider.