Critical Resistance
The biggest issue with this boss. You can’t crit when you are fighting against Tiamat. This means you have to remove all your crit gear / cards and focus purely on attack buffs.
This makes Tiamat an easy opponent to plan around but one of the hardest bosses to get a high score since it’s purely going to depend on your gear and how many dupes you have.
Depending on your level, you can run no healers at all, opting for running buffers with shields like Erin and Galahad with her immunity.
Overwhelm
Attack reduction for everyone in the team. This can be offset with gear, cards and passives of your units. It’s only 6% so pretty easy to overcome.
Knockback Immunity
A passive you don’t have to worry about at all since we barely have any units in the game that can move bosses.