The Elemental Wardens

The Elemental Wardens are the keepers of the Elemental Cores.

They sit on the Elemental Thrones, scattered across the Planes.

The first were Harail (the Aerial Core), Laifan (the Fiery Core), Neraf (the Liquid Core) and Ferelas (the Earthen Core). The Soul Core had no Elemental Warden until much later.

The Last Elemental Wardens
The last Elemental Wardens, before they were sundered and causing the Planar Clash, were:

Eriv (the Aerial Core)

Karazh (the Fiery Core)

Volcha (the Liquid Core)

Zaren (the Earthen Core)

Haiev (the Soul Core)