In addition to the Hall of the Novice and Mentor system, I think they should have added new Guildhests for some of the recurring mechanics in late-game content. The following are not covered by the current Guildhests:
  • Tethers
  • Stacking to split damage
  • Divebombs
  • Enemies that ignore enmity
  • Tank Swaps
  • DPS checks
  • Hiding behind objects to avoid severe damage