In Hogwarts Legacy, the Crossed Wands side quest chain has you joining an unsanctioned dueling club where you’ll face other students to see who is the best duelist in the school. These side quests first become available after attending your first Defense Against the Dark Arts class and speaking to Sebastian Sallow afterwards.
Round 1
Obtained: Head to the Clock Tower Courtyard in the South Wing and speak with Lucan Brattleby.
After speaking with Lucan, you’ll be able to have your first duel against Astoria Crickett and Lawrence Davies who scale to your level. Since this is your first duel, Lucan will partner you with Sebastian. To win the duel, you’ll need to reduce both Astoria and Lawrence’s HP to 0. They will generate yellow barriers around them to protect against spells. Use your Levioso spell when the barrier is up to break it allowing you to get a few hits in. When prompted, use your barrier and hold the button to stun one of your opponents. After your victory, Lucan will say it will be some time before the next duel and the side quest will be completed.
Round 2
Obtained: The second Crossed Wands side quest becomes available during Professor Hecat’s Assignment I.
Travel to the Clock Tower Courtyard to find Lucan. Speak with him to start Round 2 for Crossed Wands. If you haven’t completed Spell Combination Practice, you’ll need to select Crossed Wands from the prompt. You can choose to duel with either Natsai or Sebastian. This time you’ll be facing three duelists that scale to your level who use new violet shields in addition to the previous yellow ones. You’ll need to use charm spells like Accio to break through them. Defeat them to complete the side quest.
Round 3
Obtained: The second assignment becomes available after bringing Professor Fig the book you got from the restricted section.
Head to the Clock Tower Courtyard and speak with Lucan to start the final round of Crossed Wands. This time you’ll be facing four enemies that scale to your level so you may want to bring a partner with you. Each of the enemies will have a barrier you’ll need to bring down to damage them. Once all four have been dealt with, you’ll be deemed the dueling champion and awarded the Cross Wands Champion Garb outfit appearance. This will also complete the Crossed Wands side quest chain.