A saves monster / debuffer with full BAB on side A
And a sorcerer build on side B is a great combination

Side A

Paladin of tyranny 4/Hexblade 4/Blackguard 2

paladin of tyranny -2 to all saves
hexblade curse -2 to all saves
consider how useful a +4 DC to your spells is

add in CHA to saves twice (paladin + blackguard)
mettle
throw in a ring of evasion and you're in business