Black Mage Sanctuary - A Guide to DPS

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Tri-cast's value is the total amount of seconds you shave off in excess of a spell's gcd by making 3 spells insta-cast.

If Fire4(on leylines) is 2.35cast and 1.96GCD then the value you get is .39sec. That's 0.39secs x 3 = 1.17seconds.
If B4 is 3.23/2.30, T3 is 2.30/2.30, F3 is 1.37/1.96 then the total value you get is .93+0+0 = 0.93seconds.
- Do note that you are coming off umbral 3 so your F3 has reduced cast-time

It's marginal but tri-casted Fire4 is better. Plus hearing three Fire4s go off in quick succession is a joy.

As to using tri-cast under leylines, it does not negate its value but merely reduces it due to the lower GCD but as long as you use tricast on spells with a longer cast time over GCD then it will always be a gain:
- My Fire4(on leylines) is 2.35cast and 1.96GCD then the value I get is .39sec. That's 0.39secs x 3 = 1.17seconds.
- My Fire4(off leylines) is 2.76cast and 2.30GCD then the value I get is .46sec. That's 0.46 x 3 = 1.38seconds.
*Spellspeed of 1652