I hope this is gonna help players who are facing Baha,Levi and Odin for the first time.
For Bahamut and Leviathan there is this trick that uses Grace where you stack her -20% defense for dragons for 5 times and then you will be able to one shot them with physical attacks afterwards. This trick doesn't work against Odin because Odin is a Celestial and not a Dragon.
Here are some videos demonstrating the trick:
Make sure you setup the positions of your units before the boss stage,if not you'll have a hard time.
The next trick is the Red Starwhip trick. It's the same as using Grace but instead of using physical attacks, we now use magic attacks. You stack RSW's -20% magic defense 5 times and one shot them afterwards.
Videos:
*Bahamut *make sure you bring ice mages,Bahamut can only be damaged by ice elements. Even with -100% magic defense,other elements won't hurt him *Leviathan *Odin
If you don't want to cheese your way through the event,you can of course fight them the normal way.
*For Bahamut,bring ice mages and anti-fire capsules and you'll be fine. *For Leviathan,bring fire mages and anti-ice capsule. Bring an ice mage because you will need ice damage to break her shield. Once it's broken,move away your ice mage. Bring a levitation unit if you are afraid of mines and Leviathan's Maelstrom (levitation will make you immune towards both). *For Odin,just stack Bow units and you'll fuck him up easily.
Here are the map layout for the boss stages: Bahamut, Leviathan, Odin
Hope I helped.
