Warlock – “Expansion” [4th campaign, 2nd mission]

I'm sure I'll remember where the third Castle is when I play this mission for the second time. The second time around (at home), I'm still only on the 4th mission of the 2nd campaign. I'll be playing it for a while – until I level up Agrael to level 30. And I'm playing this one at work during my lunch break – I don't play during work hours.