Tempered will is very useful. I can think of a few uses that it's saved my ass right off the bat... Heavensfall in T9, Titan EX, A3 knockbakc when not in the center, Nevereap boss, Taking landmines in T8 without eating 2 others from blow back, Divebombs in T5 when moving the snakes from the pit early, T10 Wild Charge, T13 Divebombs, T9 divebombs, Shiva Avalanche, Levi Ex knock back on boat, Add dps in ifrit ex while preventing knockback, Demon Wall Back in the day.