BossTweaks is a plugin that makes the Ender Dragon and Wither fight more difficult in several ways. It has a primary focus on the dragon battle, but still makes small changes to the Wither fight.

Tweaks to the dragon battle:

• Cuts damage by 75%
• Occasionally spawns the following:
  • Blazes
  • Ender Crystals
  • Pillagers
    
  • Ravagers
  • Skeletons
  • Vexes
    
  • Witches
  • Wither skeletons
  • and TNT (toggleable in the config file)
• Spawns Blazes and Pillagers when leaving the perch
• Optional: Drop dragon egg when dragon dies
• Optional: Drop elytra when dragon dies

Tweaks to the Wither battle:

• Cuts damage by 33%

Both affected boss battles can be toggled within the config file. TNT is also disableable as it tends to leave a fairly big scar on the end island which is unlikely to be desirable on public servers.