Once you are inside, go to the Slum and find the Hospice there.
Kaspar will join you as your party member.
In the next room, there is the Crystal Spider waiting for you.
The most important thing here is to shorten the distance.
It does not use its AoE attacks then and attacks individual heroes only, although just as strong.
At some point, it will start to teleport and start being active, out of a sudden.
The Spider is very tough, but has few health points.
The first moment is the worst, where you oughta strive for short range combat.
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