The Elder Scrolls IV: Oblivion/Walkthrough/Arena
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The Arena
Fast travel to 'Imperial City Arena' and then find your way to the entrance of the big arena in the middle of the area, there is a Wood Elf called Hundolin there between 9:00 am and 9:00 pm, talk to him and tell him you don't want to bet right now, and then ask about 'Becoming an Arena Combatant' to activate this quest.
Now follow your quest marker and you'll find Owyn, talk to him and tell him you want to be a combatant, then just chose what ever armour you want, light or heavy.
Equip your arena armor, then talk to Owyn and tell him 'Ready for a Match'. Now make your way into the main hallway of the arena bloodworks and go east, along the north wall a big door opens up, go in this room and find the path to the north west, once you get to the door to the arena, open it and the announcer will say a few things and you'll be fighting.
After winning your first match follow your quest marker back to Owyn, talk to him and you will get your reward.
Repeat the last 2 paragraphs for each round in the arena. After every 3 wins you will be promoted, which makes the enemies you fight slightly stronger and your rewards slightly larger. For your first 3 fights your rank is Pit dog, after winning 3 times you'll be promoted to Brawler, then Bloodletter, then Myrmidon, then Warrior, then Gladiator, then Hero and finally to Champion.
After you've fought all 21 rounds to become Champion you can challenge Agronak gro-Malog, the current Arena Grand Champion for the title of Grand Champion, to do this go talk to Agronak gro-Malog, tell him 'Yes, I wish to challenge you.' Now go speak to Ysabel Andronicus and tell her 'Ready for a Match' then you get to chose a name for yourself. After you've chosen a name make your way to the arena.
If you completed the Origin of the Gray Prince quest, you will be able to defeat Agronak without taking any damage at all, but if you haven't complete the quest, he will fight you in full force.
After defeating the Agronak you can loot his corpse and take his raiment. Once you have the armor, make your way back to Ysabel Andronicus, talk to her and chose what raiment you want.
You are now the Grand Champion, while there are no more true matches for you, you can participate in weekly matches against monsters from around Cyrodiil. The weekly matches difficulty and reward is dependant on your level. While the quest is still active in your quest log, I am considering it complete.
Origin of the Gray Prince
Find Agronak gro-Malog in the arena bloodworks, talk to him and ask him about 'The Gray Prince' to activate this quest. You will also get a map marker for Crowhaven, a fort just north west of Anvil.
Now fast travel to your nearest quest marker and then follow your quest marker to get to Crowhaven. Once you get there, go inside and you'll get a quest update, then just follow your quest marker.
Your quest marker will take you to Lord Lovidicus, a vampire, kill him and then keep following your quest marker to find his journal and take it. Now just follow your quest marker out of the fort and then fast travel to 'Imperial City Arena' and then follow your quest marker back to Agronak.
Now when you talk to Agronak you will complete this quest, but he will become depressed and when it comes time to fight him for the title of Grand Champion, he won't fight back. Its not really that much fun. If you don't complete the quest and finish the Arena anyway.... you may have to complete it to talk to the Gray Prince into fighting you if you've already started it, it may be that the only way to fight the Gray Prince is to do so without ever taking this quest.
