Into Broceliande Forest, if you use the cannabis and then the Fem&Ms, you can follow the first two paths to St. Anselm's sword. But you need a third drug to finish your journey.
Go to the village, and then to the pillory.
Talk to the witch and ask her about St. Anselm's sword, then ask her about the Smurfette's drug.
The witch will help you if you get rid of the anger management coach and the angry crowd.
Talk to the angry crowd.
Talk to them again. You need to become deaf to support their endless chit chat.
Lancelot gives you a hint: 'Honey catches more flies than vinegar'. Maybe the swarm of bees at the forest's entrance could help?
Use the deflated balloon on the burning stake beneath the witch.
Go to Broceliande Forest's entrance and look at the swarm of bees.
Use the balloon filled with the stake's smoke on the swarm of bees.
Use the beeswax on yourself. Now you know how to become deaf.
Go back to the village, and then to the pillory.
Once near the pillory, use again the beeswax on yourself.
Once the stake is off and the coach and the crowd are gone, talk to the witch. She gives you the key to her lab.
Once entered into the Holy Grail's Monastery Castle, you see the drunk monk and the naked girls again. Follow them upstairs to the Board Of Directors' Meeting Room.
After the PowerPoint presentation, go back downstairs and enter the Scriptorium.
Talk to Martin L'Uterus and his disciple.
Ask them about the Holy Grail and the Holy Grail's safe.
Then ask them about the two keys, the code, and then the missing page.
Once you have the naked nuns' key, the drunk monks' key and the code, go to the Prayers Factory(on the second floor of the monastery) and use them on the Holy Grail's safe(on the far left of the room).