I've fought RDk 20 times so far, and can't help but look forward to the third dragon that will descend sooner or later. I'm trying to get 6 holy dragon otomos in the hope that, like the RDK fight, otomos can actually get me through IDK. But a quick thinking yields less optimistic prospect, at least for me... According to Wiki, IDK will rotate between vertical, horizontal and area attacks and is also capable of using four levels of graviton attacks targeting all, which I think is similar to PDK's Thrash all. So I'm guessing that one will need to combine the two strategies catering to the first two dragons to beat this one: huge amount of photon damages inflicted on the boss and magic tap buff to skip the attack-all phase or high enough graviton defense. If that's remotely true, it'll mean that besides holy dragon otomos, one'll also need a new Z char with magic tap buff (or impair) skills or graviton defense capsules. Those not having both might be screwed... Then considering the dragon's high HP and the precious otomo's one-time-only drop, TB surely has the toughest fight so far planned for us. That said, my only wish is that kinetic colliders and photo balls won't appear simultaneously (or in turn) in that battle field.... Also, maybe new DNA recode chars will have one of those new skills needed. My Daiana and Korin stand ready... Of course, the wiki content is subject to changes and these are merely speculations from a far from professional player. However I'd like to hear other thoughts and maybe reliable info leaks from veterans so that I can decide if I should grind the dragon to aim for an ultimate win or just keep calm and wait for a great pull.