Okay, if it's literally true that RTB's delay adds directly to attack delay, that is a real shame, because it basically ruins this garment for the auto attack builds which (I can only assume) are the target audience. And I don't mean ruin in the sense of "well, Battle Surcoat is relatively non-competitive with a well-enchanted FAW," I mean ruin in the sense of, "you might be better off wearing nothing at all in that slot than wearing a +9 Battle Surcoat." I'm not joking.
Let's assume you can achieve a 100% base crit rate and 193 aspd with or without Battle Surcoat (hardly unreasonable). At 193 aspd, you attack at a rate of approximately 7.1 times per second, or one attack every 0.14s. All of these will be critical hits. Let's also assume that you have sufficient DEX and AGI to reduce RTB's cast delay to 0.33s (i.e., a substantial but not abnormal investment in these stats).1 You might wonder, at a mere fraction of a second, how bad could the impact of RTB's delay on auto-attack DPS really be? It looks like, really god damn bad. When you equip a +9 Battle Surcoat, your stream of auto attacks basically splits into three groups, each with its own effective attack rate:
- On 20% of your hits, RTB will trigger (remember, RTB has priority!). Its total attack time will be 0.14s+0.33s, or 0.47s, i.e., 3.36 times as long as a regular attack. Yes, RTB "hits" three times, but because it can't crit, this is, if we're being generous, basically a wash with a single critical hit assuming decent gear. So for practical purposes, this is a half second critical hit.2
- On 40% of your hits, Level 10 Double Attack will trigger, letting you crit twice and effectively doubling your attack speed (Double Attack, you're our only hope!) to 0.07s per hit.
- On 40% of your hits, you'll attack at your normal 0.14s per hit rate.
So, how does this all add up? The long run effective critical hit attack rate under our assumptions should be: 0.2*0.47s + 0.4*0.07s + 0.4*0.14s, or 0.094s + 0.028s + 0.056s or 0.178s per hit. That is, for the low, low price of admission to a +9 Battle Surcoat3, auto attack DPS dropped by 27%. (Per notes below, however, this is actually optimistic - for many players the DPS loss is likely to be much worse).
This cannot be intended - the mechanics of this thing are literally broken. And perversely, Battle Surcoat becomes more useless and broken the higher your aspd and crit rate/damage become. That is absurd. You can't call RTB a "balance" to Level 10 Double attack when its impact is this bad. If I have screwed up the math here I would welcome enlightenment, because I would love to love this item, but as far as I can see it is likely to be worse than useless for the only builds that would even give it a second look.
Notes:
(1) This is actually optimistic. Lots of physical Rune Knights in particular shortchange AGI and DEX because you can get 193 aspd nowadays with minimal AGI and, of course, crits always hit. In that case, RTB's delay could be much higher, half a second or more. That level of delay has a truly awful impact on DPS, cutting it by half or more.
(2) Here again, this is actually optimistic as characters head into the end game. RTB could easily shortfall a critical hit by double digit percentages in terms of damage, reducing DPS still further.
(3) And God help you if you're using anything but a +9 Battle Surcoat - at lower upgrade levels, RTB procs more often, for lower damage, and DA procs less frequently...
Edited by INREM, 01 August 2018 - 02:14 PM.