Allow Bosses to Roll Immune to Sword

[TheRealQuantam]

Allow bosses, like enemies, to be able to be immune to normal attacks and require fire, to allow for seeds in which fire is required.

[MiR4i]

Currently, no bosses are susceptible to projectiles, which is how fire damage is done to enemies. With that said...

• Should bosses be allowed to be damaged by projectiles?
• Should the Fire spell act like the Thunder spell does with Thunderbird, making the boss no longer immune to Link's sword?
• The Fire spell stays expensive until later Magic levels, which would be punishing if Fairy is the expected way to progress through doors found in palaces. Should players expect to not be able to enter palaces until a much higher Magic level with this setting enabled? Should spell cost curves be adjusted specifically when this setting is enabled, making magic cost curves different than other modes?
• Have you thought this through?