Ferelden Castle - Overview
This level has easily the highest number of enemies per round\total. Excellent for farming kills, provided you don’t mind dodging dragon blasts.
There is often a golden nug in the 1st area, just past the second treasure room door, or 3rd area on the first set of steps, before the drawbridge drops and reveals the gong to call the dragon to the summit.
The final area:
No Dragon Call: In a hurry or low health? Track down the Commander immediately - the sooner they go down, the sooner reinforcements stop spawning. The lowest number of enemies I’ve managed here is around 15.
On the flipside, if you’re farming kills, specifically avoiding killing the Commander can result in spawning just short of 100 enemies for this battle.
Dragon Call:
In a hurry to take down that dragon? Mind siege weapons on either side of the summit. They can be prepared by turning the wheel on the side until the rope side is touching the ground. Avoid setting them off until the dragon has landed on the opposite tower, they will miss if the dragon isn’t there.
Wanting to slaughter some dragonlings? Ignore the siege weapons, kill each round of dragonlings and then drive the dragon off again when it lands, repeat. I’ve watched another player wipe out 200+ dragonlings this way, not sure what present limit is.