Welcome to Librarium Online!
When my ogres are completed i will be facing alot of empire and i was just wondering how ogres do against them.
That's right, llamas can parachute.
The advantages you have against Empire are speed and fear. If the Empire army has a lot of shooting, as they often do, you want to close to combat ASAP so that you're under-armored Ogres aren't shot to ribbons.
Of course, fear works best when you outnumber the opponent, which will be tricky with small Ogre units, so you'll want to go for flank charges and multiple charges as much as possible.
A scraplauncher might be nice against ranked Empire Units.
Gut Magic could really help against Empire Knights. There are some spells that would really knock them for a loop.
I personally don't like the scraplauncher because some scouts or fast cav could force it into terrain and it would self destruct. I prefer gorgers to take out war machines and or yehtees. Maneaters are ItP so they might be helpful. Keep your tyrant in a larger unit if they have cannons, otherwise they can pick him out and blow him to smithereens.
Panic test! make them take as many panic test as you can. take skull mantle as well.