Add a fun special interaction to prevent farming alchemy ingredients by intentionally failing the ruined dungeon orb sequence

In practice this change does nothing, but good practices and it may get copy pasted later

This may look like buffs but it actually makes the game harder: randbosses use starting talents to determine what to put points in, so this will make sure they have weapon mastery and accuracy ;)

Why does everything not get this to begin with as part of the base function for spawning any new npc?

Modifying Toxic Death a bit in the following 2 ways:

1) It will always spread Vulnerability Poison first. 
2) It won't spread Stoning Poison to an enemy already stoned.

See merge request !643

Eternal Night now also costs 2 souls to sustain

Discarded Refuse now scales the number of effects affected by turns but no longuer unsustains itself