How is BLM in new expansion?

[Urielparadox]

Uhhhh, an immune boss won't be affect by any DoT so Thunder is useless.

Yes never reap goes immune, however dots still ti and thunder starter still procs. Boss aren't always immune when you loose the ability to target them. Even if the boss takes 0 damage the spell still hits and crits for 0 damage, or ticks for immune damage and still gives you a thunder starter proc, because all c thunder cloud require is the dot tic not for it to do damage. For instance in AK HM the final boss takes 0 damage while he charges but isn't immune, you can refresh umbra ice, or get a firestarter proc ready, and cast thunder in hopes of a proc. That way when's done casting you have all the tools you need to jump back in at full damage.