ToEE: First Level and Earth Temple

Walkthrough
Death Ward is strongly advised as enemies will cast Enervation on higher difficulties.

You need to disable the northern and eastern runes in order to unlock the gate to the Earth Temple. Head over to the eastern side of the map, the eastern rune is guarded by Harpies that can disable you with Soothing Song, you will receive a pop up message when you enter the rune. The northern rune is guarded by a rapid fire Ballista that does extremely high damage, and hitting the guard using it is difficult as the ballista blocks projectiles. There seems to be a secret door allowing you to bypass the ballista's arc of fire. Approaching from the south will also allowing you to avoid the ballista and you may be able to kill the guard from range, but there is a spiked pit and you will need a way to leap across it to enter the room.

After disabling both runes, head north from the ballista room to enter the temple. Go to the middle and kill the four red named Earth Elementals to drop the barrier to Romag, and kill him. Loot the named chest and earth temple key, then exit the earth temple room to the north, head south, and disable the earth barrier to complete the quest.