Inferno Pits improvements

[Addah]

There are a few minor adjustments that would help make the inferno pits a more interesting experience every time.

1) At least 1 of the 2 immunities should be variables and change for each enemy, instead of everytime Griswold being immune to Ice and Poison and Lilith being Lighthning and Poison immune, for example. The end-game content should not be so consistent and should have more variables like this to enhance the experience.

2) Remove the common low quality items in the final loot chest, perhaps add lots of gems and a chance for gear to drop, because as it stands now the only real loot is in killing enemies. Perhaps the final chest loot can be improved by killing every enemy in the pit.