Instinct says your PG are an absolute gimmie for Dwellers, Final Transmutation and the Dreaded 13th. Conventional wisdom is to give your BSB the Banner of the World Dragon and have him in the unit if you're serious about the PG deathstar thing.
Looking for a friendly wargaming club on the Isle of Wight? Drop me a line.
Sisters of Battle - The Order of Glory Undimmed - 2'500 Points | High Elves - House Cyredeth - 2'500 Points | Bretonnians - The Muster of Sir Jules Estelle - 3'000 Points