New Guild Quest at 55
A regular zone mob in AV or TH (either kill or loot), about 50k XP from guild board I, 66k from guild board II, and 100k from guild board III
New Guild Quest at 60ish?
Instance mobs in Raksha Temple or Kawak's Tomb (either a kill or loot), about 75k from guild board I, 112k from guild board II, and 150k from guild board III
New Guild Quest at 65
The "If I Persevere Quest", but as a guild quest, 150k from guild board I (but lower requirements), 200k for guild board II, and 300k from guild board III (with higher requirements)
New Guild Quest at 70
Something with ToSH? TB? No idea what to put there
And we all know there's four spots available for a guild quest board, but only 3 available boards. I also propose enabling the fourth board with similar quests as the first 3, but with higher requirements to complete the quests. XP/TP/gold rewards would scale up, and you'd receive 20-25 rubies.
Board IV would also have the final boss from Kawak's Tomb, for about 700k XP, or next to last boss in Grafu for about 850k.