I would help you, but my alt accounts don't have membership.
Just an advice for you.
Ultra Kathool is a lot more difficult than Ultra Iadoa, is even the hardest monster on AQW on my opionion. You will need a really good team to kill him.
Ultra Iadoa is pretty easy to kill. Just make a team with 3 Thief of Hours. Using the last skill you should kill him on less than a minute.