When To Use Ninjitsu and When Not To Use It

[Sol_Aureus]

Doton for 3 or more enemies that will be able to survive the entire dot duration. That's basically it for the dps part.

As for the heavy portion, I don't think any boss fights (excluding final coil since I haven't done it yet) needs it.

This is correct. Doton is so situationally useful that I'm surprised I see it so often. It's a 24 second DoT at 30 Potency, so if literally every tic of the DoT hits it's 240 potency total. If stuff dies before Doton's timer reaches 6 seconds, you're better off using Katon for AoE (missing 2 DoT tics on Doton puts it down to 180 potency, which is equal to Katon's potency.) And on Single Target, Raiton is still king at 360 potency, so there's never really a reason to use Doton on single targets. The only time I could ever think that it would be useful in current content would be Twintania if she's being tanked on top of where the Dreadknights spawn so that the Heavy effect slows them down a bit initially, and even then that's pretty situational. Arguably Raiton is still more beneficial to push her out of the phase faster.

Doton has it's place, but it's against 3+ targets of survivable adds where tanks know not to pull mobs out of the AoE...most of the time I just end up using Katon and not worrying about it. Faster ninjutsu timer anyway because it's 2 Mudras instead of 3.