GO right above the swamp portal, that is, north east to the swamp portal, you will find an area covered by black bricks and a totum that will MUTE you units, DON't step on to them just yet cause they will explode... you need a way to detect invisible traps. And you also need both air-mege teleport or rouge teleport.
1) kill the totum, that will allow your teleport skill
2) try throw a grenade(don't throw) and hove the circle around and you will detect invisible mines, or try to cast a area spell, that will work too.
3)teleport your unit on to one tile that will not explode.
4) teleport again to the lever[behind the totum], the right door will unlock.
5) pull the lever and the traps will fail,bring your party in, and enter the area behind the the central square, that is to the top part of the map.
6) there you find a altar and a lever, to unlock it you need to find three statues that match the three glowing patterns around the altar, bring them in and place them on the pattern, pull the lever, and boom, comes the portal mirror to the WATER element switch.
