the empire dont have a primary combat lord. the tgm is stuck as cavalry with only cheap throw away units or expensive yet outclassed so called elites (or loses his look out sir) and generals blow next to any and all combat heroes - oldblood, vampires, slaughtermasters even, princes, unkillable dreadlord, khorne heralds, warshrine buffed chaos sorcerors tomb kings are all wandering battlefields these days. and utterly outclass the general. the general is a cheap leadership boost, an arch lector is the same but also grants 3 units hatred and a prayer.
I have to try the altar out sometime then - the aura is a bit too selective so may try a dual altar list, backed by a hurricanum or two.