You have to collect 1000 favour points for each raven.
Wood
You can use dry pieces of wood to receive extra favour points. You can loot dry pieces of wood from Bane Lord and Bane Bringer . Note that these pieces must be used on the slide of the cauldron.
Ingredients
Ingredients are shown in a room before you get to the cauldron's area. The ingredients you need are chosen randomly (except for the first, which is always Lump of Dirt on all servers) and can be repeated. The cauldron needs 200 of the needed item every phase.
Items | Favour Points |
Adding a wood piece | 1 |
Goblin Ear | 5 |
Lump of Dirt | 5 |
Spider Fangs | 5 |
Bat Wing | 10 |
Centipede Leg | 10 |
Scorpion Tail | 10 |
Marsh Stalker Beak | 10 |
Minotaur Horn | 15 |
Tarantula Egg | 15 |
Sulphurous Stone | 15 |
Lancet | 15 |
Small Flask of Eyedrops | 15 |
Source: https://tibia.fandom.com/wiki/Bewitched#Ingredients
Bewitched starts from 21.06 to 25.06. In my opinion you can obtain one raven by your activity in this event. I think it is also possible to obtain the second one raven but you have to buy dry pieces of wood from other players from extra points.