Purpite Ore

Purpite Ore would be a Purple Gemstone that spawns commonly throughout the End Isles. With it, you could increase the Difficulty of the Ender Dragon and Wither Boss Fights on Repeated Battles. For the Ender Dragon, throw a certain amount of Purpite Gems into the Exit Portal before resummoning it. For the Wither, make sure there are dropped Purpite Gems in the vicinity, which will be sucked into the Wither when the initial explosion occurs.

A higher Quantity of Purpite Gems would result in more Health, Damage Output, EXP, and Rewards. For the Dragon, there could be Dragon Scales which could upgrade Armor and Tools, or maybe even Anvils and other Workstations to make them more Efficient or Durable. For the Wither, you could get Wither Essence, which would let you make Potions with the Wither Effect or act as a more potent Blaze Powder when Brewing.

Smaller Things:

- The Color of the Exit Portal will change when more Gems are thrown in (Black to Purple to Lavendar to White.)

- Some additional Arena Hazards and Techniques could be added as the Difficulty Increases. End Crystals that attack you, Phantoms spawn when a Crystal is broken, the Wither could have its dash attack, etc.

- Hints to this mechanic would be nice, like maybe a room where a replica end Portal has Purpite Gems in the Basin or End Crystals surrounding it.