DoT questions

[Viridiana]

6)
Do ticks have a chance to crit
or
are ticks all crits if the spell is a crit when it is cast ?

Each tick is its own chance to crit. The only exception is a NIN using Kassatsu (force next Ninjutsu to crit) followed by Doton, which will make all Doton ticks crit.

Nice, thanks.

So, in fact DoT actually deliver the full potency over a period of time. If I hit that 15 seconds DoT, potency 30 = 150 potency for a total time of 15 seconds?

What about auto-attacks? I know that AA potency depends on the weapon's damage but it hits around +-3 secs right?

I'm thinking in terms of SMNs, this is quite a good thing because only SMNs would have an "AA" spell called Ruin (Cast spell for +-3 secs, comparable to AA) with a flat potency of 80.

So if I apply that Dot (30 potency) and cast ruin right after (80 potency), for every tick I am in fact doing a total of 110 potency for 15 seoconds MINUS one tick of ruin (supposing that DoT ticks RIGHT ON THE SECOND IT IS APPLIED).

So... 330 - 80 = 250 potency. 100 potency more than only with DoT. An improvement.

Therefore, 5 ticks of DoTs + 4 ruins would result in that. But what if my spell speed is less than 3 seconds, say... 2.5 seconds, I would sneak in approximately half a ruin right?

Auto attacks are, roughly speaking, 100 potency per three seconds, regardless of the delay stat.

Also, you flubbed your math there. Just the four casts of Ruin would be 320 potency, plus the 150 potency of the dot. Then figure that you should be able to fit another Ruin in there (because it's a 2.5 cast instead of 3.0) for 400 potency.