Another strategy which ultimately relies on prof x: use winfinite. It helps to have a team up that creates strike or attack tiles to carry along just in case.
So I’ll try to keep this on topic I guess. I haven’t yet attempted round 6+, but round 5 I found to be somewhat beatable. I ran OML(452)/Phx(456)/ProfX(283), OML/Phx/SS(453), and OML/Phx/SWitch and beat it with all three. I found GG to not be that tough. I tried to deny black as much as possible, but if he does summon his goons - not a super big deal as you can kill them and it will still deal damage to GG, so it doesn’t really prolong the fight much. So I used the first GG wave to gather as much AP as possible. Cap next can be annoying with the protect tiles, and one time he used his shield bash on me 4 rounds in a row. It “only” hit for 11k damage though so it was manageable. You HAVE to transform OML before the end of cap, and you HAVE to end wave 2 with an ability so that OML doesn’t show up with claws popped ready to rip your face apart with all the green AP that has been collected for the previous two waves (a Rulk TU helps here if you have to give him a turn.) I used Phx Green to get OML’s health below 40% so that his red would hit harder and down OML in 1 turn.
I liked the ProfX team the most. The match 5s generating a ton of black really helps later when you finally transform OML. SS was kind of worthless, his blue was unreliable, and his black hole too slow to stop the bleeding if I needed him to. SWitch works well, but you are still relying on a 3 turn CD which in later waves you usually don’t have 3 turns to wait to generate AP. One battle I gathered a ton of AP and popped OML’s claws right before the end of wave 1. His health was really low but I actually managed to get through both Cap and OML using all the AP I had stored up thanks to Phx purple making red which triggered ProfX blue to make black.
My plan for Rd 6 is to try to store up enough AP in wave 1 to kill Phx before she gets a turn. Not sure if I want to try SWitch or ProfX first though. Leaning toward SWitch. Wish I had IM46 at a usable level as his blue seems to be a pretty hard counter for this boss.
Match red and green. Let hood generate the rest of the ap. Get as close to 30 red and purple in the first wave and flip OML when he is under 60% health. Then hopefully between casting OML red and generating additional red with Phoenix they don’t get another turn.
Good team ups to bring to help with red ap generation.
4 star Cyc
3 star yellow Cyc
IMHB blue
IM46
Cho provides a persist CD for kp to pop. This does 11k damage for me. If the CD is at 1 just let it expire, the green ap and cascaded it can possibly generate are good as well as damage.
Only use Cho green if your blue ap threshold is met. This does 19k damage for me.
As for kp yellow and purple, spam yellow as often as you can. The CDs work with his black and extra damage and strikes are great. For purple try and end each round with a skill and have enough purple ap for a cast. The ap drain + Peggy passive usually mean this prevents the new boss from using a high damage ability.
Peggy is there just for her passive, though red can be useful against cap and blue can be good for any goons that want to prevent boss damage. Try not to use blue until after a Cho green usage.
Im40 could speed up Cho green extra damage condition but I feel giving up Peggy passive isn’t worth it.
Xfdp will probably trigger his passive at rd6 and higher. He could be useful though again I think Peggy is probably better.