That's the beauty of Seraphim – you know exactly who the opponent will focus their main attack on, but killing them isn't that easy;), while Haven has other units that could be considered the best. The most interesting thing is that even knowing all this, the opponent will face a choice: either attack the Seraphim with all their forces, making their actions predictable and exposing their own troops, or get hit in the face with their magic! It's not a pleasant choice:D