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There is a tree in the Dungeon, near the obelisks with the monk – in the lower right corner, near the well, there is a pit.
Also, a tip: when choosing magic, look for it near the obelisks – they will give you additional spells and spheres to gain expert knowledge. It is better to choose earth and water magic – these will be available, and you will have access to mass slow, mass weakness, and prayer, so you can manage without any major problems.