So, you want a card from an event chest to enable you to upgrade a single trinket from rare to epic? Why not ask for higher chances to get epic trinkets from chests directly?

Hmmm, yeah, what they said. We could certainly try to suggest some ways to tweak or change how trinkets function, but I can't see tying a new trinket mechanism into event chests specifically.

But the relative value of trinkets does kind of end up in a weird place after you've been playing for a while. I currently have:
* 1306 brass ring: at 1% each, that's 1306% DPS
* 610 silver ring: at 2% each, that's 1220% DPS
* 148 golden ring: at 4% each, that's 592% DPS
* 20 diamond ring: at 8% each, that's 160% DPS
** grand total = 3278% DPS

The common items account for 1306 / 3278 = 39.84% of my bonus.
The uncommon items account for 1220 / 3278 = 37.21% of my bonus.
The rare items account for 592 / 3278 = 18.06% of my bonus.
The epic items account for 160 / 3278 = 4.88% of my bonus.

Epics [i]sound[/i] nice with their 8% apiece compared to the 1, 2, or 4 on the lesser quality items, but in the grand scheme of things after however many thousands of silver and jeweled chests (let's see what my stats say... over 28,400 silver and exactly 806 jeweled chests opened (which includes event chests and purchased chests, I think)), epic trinkets are actually a fairly small piece of the trinkets DPS bonus.

Plus there's diminishing returns on each new trinket as more and more of them pile up. If I'm at 3278 and I gain one more epic for a new total of 3286, I've only increased the size of my bonus to x1.0024 times larger.

Anyway...

The proposed new item to upgrade a trinket... Well, first off this new item would likely just be in the same "bucket" that trinkets are drawn from, so instead of ending up with common, uncommon, rare, and epic in a ratio of 40 : 37 : 18 : 5 you'd have a few shaved off somewhere to create a few of the upgrade items (instead of 100 trinkets of various quality it might be 96 trinkets of various quality + 4 upgraders) So you get 211 / 226 = 93.36% as much % bonus out of the RNG compared to results from before the upgrade item was added. (226 being the value for 100 trinkets in those ratios, 211 being the value for 96 trinkets assuming that each quality loses 1 for there to be upgraders.) But then you use those 4 upgrades to turn some rares into epics and end up at 227%. Just +1 value compared to the original ratio. (At least based on my numbers. RNG is RNG and each person could see better or worse depending on their luck.)

Or they could go for upgraders getting a much larger share of the bucket than that, resulting in an even smaller number of actual trinkets picked up to begin with but allowing for many more of them to be pushed up in quality. Like maybe we get drops in a ratio of 35 common : 32 uncommon : 13 rare : 0 epic : 20 upgrader. That's only 151% value from 100 results (ie 80 trinkets) but then the 20 upgraders might turn those results into 35 common, 28 uncommon, 1 rare, and 16 epic. (13R -> 13E, 1U -> 1R, and 3U -> 3R -> 3E) That's... 223%, which is 3 less than the 226% value of the original ratio... Granted, that was just trying to use all 20 upgrades within each set of 100 results, but in actual practice we'd save up the upgraders from across hundreds of results and then apply them ALL to just the rares instead of burning extra on U->R->E.

It sounds like the idea adds extra steps for what could generally turn out to be very little gain compared to what the current scheme produces.

I'd say leave the drops alone and instead consider an idea more along the lines of either:

A) add a talent to increase the value per trinket by whatever amount per each talent level (if for example it's 10% bonus at talent level 1, then 1 / 2 / 4 / 8 becomes 1.1 / 2.2 / 4.4 / 8.8, and then at level 2 it's 20% so that you then have 1.2 / 2.4 / 4.8 / 9.6, and so on up to whatever the talent caps at)

B) add an option to pay some rubies (or some crafting materials (not catalyst though unless it's a large batch purchase like 1 LC for 10 legendary trinkets)) to convert A common, B uncommon, C rare, and D epic trinkets of the same type into a legendary trinket of that type, with the legendary being worth a high enough value per trinket to see a net gain in value on that purchase (for example 2C + 2U + 1R + 1E for the ring trade might require that each legendary ring ought to be worth at least 18%, so maybe we call it 25% for a profit of +7 value)

Thank You Muljo for that incredibly complex answer to my (yes Andreas) admittedly simple muse and a desire for more epic trinkets.
Of course they could just increase the drop rate slightly but where's the fun in that?
I just thought an option to upgrade DPS or Gold could be fun gameplay.
And I only intended a potential u/g from rare to epic...like I said, just an idle desire to get a way to make epic trinkets

And I agree that epic is as far as trinkets need to go...Legendary would be silly IMO

Thank you for your answers