Why the foci? - Conjuration, for an effective Gate to teleport with, bigby epic, the orb series, evards black tentacles, a few other clouds, and the best possible summons. Evocation - for elemental damage spells such as freezing sphere, delayed blast fireball, meteor swarm and many others. Transmutation - Mainly for the Epic Wall in my case but also nice to have a decent disintegrate for those trashy mobs etc.. also Combustion is nice. Divination - Because i may aswell take advantage of the stargazer bonus feat and also because the Power World Kill is quite effective in Thids, also Contingency is a very nice Epic Spell to have in -HC- or normal play as it revives you with all the spells in your autocaster.