Firstly, it's "Dungeoneering", since you wanted the spelling. Secondly, I'll confirm what Qeltar says, however, it is not guaranteed you'll get Katagon. I duo with my girlfriend, we're both maxed melees and I've noticed that what armour you get is seemingly random (we're both maxed range too if it helps), it'll never go above Tier 8, yet often, it is below that. To put it in the most simple terms, you can get equipment up to tier 8, or the highest you can equip on the tables.