Era has a custom PVP area for it's players. There are two teams, A and B. Players do not need to complete any per-requisites to enjoy the Era PVP area.
Entering the PVP area
To enter the PVP area, speak with Tillecoe in Ru'Lude Gardens, near Home Point #1 and the Mog House entrance. They will flag you to enter the PVP zone. Then trade 2 gil to join team A or 3 for team B. You will be warped to the PVP zone, Diorama Abdhaljs-Ghelsba upon doing so.
You can also speak with Tillecoe a second time to unflag for PVP.