The most powerful Aes Sedai are having a covenant.
Ishamael, knowing these to be the most powerful Aes Sedai alive in this time, has gathered his most powerful Dreadlords and planned an attack on the covenant. The covenant just happens to hold seals to the Dark Ones prison with them. Aes Sedai: protect your seals and get the ones Ishamael has recently discovered. Forsaken: Keep your seals and get the ones that Aes Sedai have...ready, go!!
2 Symmetrical bases : Additonal author credit goes to Taqwus.