The Gatebreaker's Pit: more orcs, new magic, nobody gets stuck

A few changes to the level 31 quest, after the first runs.

More warband

• Every wave now brings 5 creatures for each player in the pit.

Magic of the pit

The creatures in the pit fight with tricks they do not use anywhere else:
- Orcs fly into a Blood Frenzy and throw axes at you.
- War drummers beat the Drums of the Pit: three blows that shake the whole cave.
- Minotaurs hit the ground with an Earthquake Stomp.
- Trolls throw boulders that fall from above.
- Grukk calls down a Meteor Rain and the Thunder of the Pit.
Each big spell shows its circle on the ground before it hits: step out of it!

Nobody gets stuck

• If you disconnect during the trial, or the server restarts, you come back outside the crypt door, never inside the pit. Your quest stays where it was: go down and try again.