Let’s start the math assuming all weapons are legendary level 440 +11 and T10.
(numbers from tos.neet)
matk[Staff]+matk[Trinket] = 16596+2085 = 18.681
matk[Rod] = 14.486
As far as I am aware, any damage dealt modifier sums with each other.
Let’s assume 2 characters have Elementalist on their builds. One has Chronomancer and is equiped with the legendary weapon with the Vaivora Ichor, the other doesn’t have Chrono and is with Staff+Trinket.
And they have the same skill equally leveled (max level, attribute enhance level 100, max Art, all the good stuff).
Let’s ignore the difference of INT, to make our numbers easier to calculate.
Elementalist has a passive attribute which increases damage dealt by Fire, Ice, Lightning and Earth properties by 9% with both weapons. Because all Elementalist’s skills are of these elements, this is a passive +9% damage modifier.
Now, the only difference is their weapon.
The damage calculation would be:
(Magic Attack)x(1+sum(damage modifiers))xSFR
So, to the numbers:
Rod with Time Rush
14.486x(1+0,09+0,42)=14.486x1,51 = 21.873
Answer: yes, it is a damage increase when used by Elementalists to deal damage with their skills. Of 7,4%.
The same case can be said about any other class, but Elementalist was used just as an example. And, as the bonuses stack with other modifiers, this damage-increase is smaller.
But now a question: are you willing to use a “class slot” with a full-support class to increase the damage of the other 2, when you could have 3 offensive classes instead, all-out on the damage department?
On top of that, the class is not that interesting. The theme is very attractive, I really like it. However casting time reduction is not such a hazard in TOS as it is in other MMOs, so people don’t bother to pick Chronomancer because of that. Slow is, right now, only interesting in PVP scenarios, and, even so, you want to trigger Lethargy instead, a debuff on the target’s defenses and damage output. Backmasking is a very interesting skill to use, but requires practice and only very specific skills interact with it. And the class was nerfed really hard thanks to its real deal in the past: Pass.
On top of that, only Slow and Quick Cast do not have consumables, which were abolished in 90% of the skills of the rest of the classes. And they are fairly expensive to use all the time.
TLDR: Vaivora -Time Rush is really good as a damage up. But Chronomancer needs the Vaivora to be something right now on PVE. You will still have fun, but the Vaivora is almost a must.
But, on PVP/GVG scenarios, the thing changes completely.
Maybe, I hope, with the reworked wizard class tree just released on kTOS, it becomes a really good option PVE. But because Backmasking and Rod+Dagger is really strong with the Vaivora.