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HM - Mijin is a non-elemental breath attack, so Unda won't help (but both 1hrs and OFA will). Above 25%, I like to use Flabra to resist the slow from Cross Reaver, which can overwrite Haste if it lands. Below, you may want to use Tenebrae to resist the damage if he manages a Light skillchain. If you find that he's WSing too frequently and worried that a Light might put his damage over the edge to kill you, tell your DD's to wait a moment after a CDC before feeding him more TP, which can cause him to miss his skillchain window. Try to save Battuta for Brazen Rushes.
Doesn't work that way. L2/3 skillchains attack with multiple elements and use whichever resist is the lowest. The only skillchain that does exclusively light elemental damage is transfixion, the same with dark and compression. "Light" does Fire, Light, Wind and Thunder damage to you with whichever you have the lowest resist being used. Buffing your light resist would only cause it to do the ME check using Fire, Wind or Thunder.
It was one of those game mechanics that really works for us whenever we're using them on enemies but is absolutely horrible when used against us.