"That's no moon..."
Hey, if a crotchety, backwoods kook, self-exiled for 30 years, can identify a battle station as not a moon, so can the mind-flayer you're hiding from.
Check and hit, I've sunk your wicket!
If you're going to catch them off-guard, how about the illusion of two ice cream cones, instead of two Death Stars? Your enemy will thank you for your colossal generosity. For extra fun, they may fail their Will saves and drown in frigid, delicious folds of death.
Or you can just shoot them with the superlaser. I know, I know, you'll miss out on 10d6 sneak attack dice, so your base damage will be a measly 299.999.999.999.999.999.990d6. But remember, with that Crossbow Sniper feat you took, you can add your Dex to really bolster your diminished dps!