I'd say 98% of raids every Tos should use Coils. On certains bosses like Emperor and T3.5 Bosses I use Idol and Eyes.
However, if you notice the tanks struggling on certain fights like Demo Keeper, then should use Idol.
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Looking for a Solo build that would work well in Grasslands
Why can't I get Storm Regalia? I can get Faithful, but I can't put any points into Regalia :(