Looking at your mastery set, I can see why things wouldn't go over well.
Havoc
is a bad mastery in its self. For every 100 damage, that's an extra 2 added onto it.
Losing out on the Flash cooldown really hurts you as well. Also, the 5% increased tower damage is not particularly great either.
24 AP gives you a total of 36 bonus damage on your ult and 6 bonus damage on explosive shot. Not really helpful. Especially after MR is factored.
You're far better off with
Butcher
and the two crit related masteries, whos names escape me, in the offence tree, and the free armor, MR and health in the defense tree.

Losing out on the Flash cooldown really hurts you as well. Also, the 5% increased tower damage is not particularly great either.
24 AP gives you a total of 36 bonus damage on your ult and 6 bonus damage on explosive shot. Not really helpful. Especially after MR is factored.
You're far better off with

I mean, does Trist really need mana regen? she isn't spam happy or anything. Havoc and the Siege mastery don't add very much damage in the grand sceme of things. Sure, they help, but not a super amount. The 9 points in Defense are hilariously overpowered, considering how much survivability they give you.
Am I the only one who just runs 21-8-1 on some ADCs?
anyways, if I was gonna run 9 utility...I'd rather have the MS and summoner spell CDR masteries than the mana regen/bonus mana ones anyways >_> they're just more universally useful.
anyways, if I was gonna run 9 utility...I'd rather have the MS and summoner spell CDR masteries than the mana regen/bonus mana ones anyways >_> they're just more universally useful.
The ms only triggers out of combat so I consider it virtually worthless. I take the mana regen, flash cd and recall timer in t1 and the summoner spell cdr in t2 when I run utility masteries. Whether you use utility or defence depends which AD you're playing and what playstyle you want.
3 mana regen/5 seconds is slightly over 1 mana point every 2 seconds, which is basically unnoticeable.
Both of those masteries do virtually nothing (which is why I tend to opt for defense points instead).
Both of those masteries do virtually nothing (which is why I tend to opt for defense points instead).
Tristana's base mana regen is 6.45 and most other ADCs have around the same (6-7). You are increasing it by almost half by taking the mastery.
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For an ADC such as Tristana I had put 27 points in the offensive tree favoring utilities such as extra tower damage, and AP for her ultimate and explosive shot. I also took the remaining 3 in mana regeneration.
Now I'll explain why I think this works... Tristana's explosive shot and ultimate scale super hard AP so the little bit of AP actually goes a long way over some ****py points in the defensive tree. Tristana can also be a tower wrecker with the extra tower damage and rapid fire. All in all I think this offers a lot more strength to Tristana and it doesn't create any huge disadvantage. What do you think?