My deathblow solo sin guide

since i suggested this initiative, i should provide a kickstart to the explanation for this...

What is Death blow?

From iruna-online.wikiwiki.jp:
Fu~yunevu~inde
Deathblow transmitted to the Assassin. I give the subject a blow that put heart and soul. Power changes in the remaining MP value.
SLv1 all MP　Quest [skill acquisition trial!] (Lv160) Clear (activated when, special state 10 seconds)
※ during special state:? When the shadow walk invoked during AVD increased visibility, HP consumption without hate -%

What it actually is, in english server-

Death blow description: Puts all power on an attack. The damage relates your MP rest.

In short, if an assassin uses this skill, all of his current MP will be drained to 0, the resulting damage dealt is factored on your MP used for this attack. Using this skill, you will be granted 10seconds of Special Status buff.

What does it look like?

Its nearly impossible to tell if an assassin uses backstab or deathblow- they both have the same animation! But deathblow- needed not to be onto the back of an enemy for it to deal maximized damage, frontstab/ sidestab all have equal footing here.

Uses all of your MP to deal a single damage in one shot...?

Thats right... whether your MP is 1k or 100, this skill will cleanse out your entire MP bar, draining it to 0 upon usage. The requirements for using this skill is 1MP at the very least. The output damage is in critical.

Hold on, so this skill...is quite powerful if you have a lot of MP?

yes. If you can drag your MP to 15k, your damage will be approx 100k. Pure damage, unaffected by defense, except purple barriers.

Pure damage from using deathblow?

That's right. This skill ignores defenses on bosses, which means your able to slice through vida defense, almas exhaustion defense easily. However, Deathblow does not cut through super defence up status from bosses, like azimov, mezzaluna, magonza etcra. (purple barriers) I believe that Deathblow has a very high physical penetration rate: with estimates of 85-90%

How do you calculate deathblow damage??

i dont have a formulae for it yet, but i have tested the following:
-refine, att up, crit dmg up,
this seems to improve damage, but not significantly.
-mp increase
damage flies with this. significantly.
-weapon type check
whether if its throwing knifes or staff/ sword usage, it doesnt make much of a difference in damage output...

this also applies to boss debuffz. Specia notorious elemental damage decline is a good example here. Anyone who faced her will feel pain whenever she drops your att greatly whenever she does that. Deathblow damage bulk results from MP, and this mp amount used for deathblow equates out to pure damage dealt- thus it will not suffer from this debuff greatly, and your damage will mostly retain the same amount. Watch out for boss that drops your MP -coughalmascough-

what is the Special status?

During this special status buff (lasting only 10s), your evasion +50%, (?magic eva). This skill is a unique skill as no matter how many gazillion times you spam this, enemy hate will not increase onto you, due to using it . (Also allows you to use shadow walk without negative hp consumption if you have already engaged the target) Being a Special status icon, this effect stacks with Shadow walk effect (dodge rate) which adds +100% evasion (+?% m eva)

So, basically to use deathblow, i need high mp?

No. There are many ways to use it, whether if its farming or to quickly achieve a fast kill in near impossible situations. High mp merely provides you a better output in the damage department. Refilling that Mp bar to achieve your damage spam would be the issue here.

What are the ways to utilize this skill?

Currently, the most favored way to use deathblow falls into two categories.
(1) Maximum damage output spam
(2) training, farming, mainly using the evasion+50% buff from the special status effect to help dodge against monsters attack

For #1, the usage of deathblow is summed up pretty much there, to deal as much damage one can dish out in a single deathblow hit. As deathblow damage majorly factors from your current MP, it would be sensible to maximize your mana capacity, to achieve high damage.

For #2, look at sorpig's post

Any disadvantages from using deathblow?

Yes, mainly with regards to MP cost here. Using up all your MP per hit is a pretty heavy price, especially if you want to be a damage dealer. Since this skill also does not increase hate upon usage, if you are the tank here, you need to cast provoke after using deathblow to prevent aggro-loss. The 50% increase in eva may seem high, but it lasts for 10seconds only, which is pretty short for a duration of a boss fight (more than enough for normal mob grinding however)

I have an idea to combat the mp loss, and that is through bless or HW/ ench MP heal!

Yes and yes. Bless provides a constant interval recovery of MP (3seconds), and this amount is enough for an assassin to relaunch deathblow to reset the 10s special status effect timer should he wish to stay in the advantageous evasion boost duration/ or to simply use deathblow as an attacking skill. (baselard also works for this)
HW/ Ench heals are more of for the purpose of maximized deathblow damage spam, any mp healing class would be irritated if they have to constantly refill your mp- making them unable to conduct other duties (like refilling other pt members mp, or to att mobs)
(/○ω○)/ SAN值 \(○ω○\) SAN值

Also, finding a MP healer that is able to heal high bulks of MP per skill cast is not easy. 10k MP would take very long to heal to MAX 状态 if your MP healer heals 1k per try. But now most wiz classes should be able to heal high since they are able to cap three stats, int dex vit

THanks for adding to my guide! i updated my guide to incl a bit more info

@godofafr maybe try the one from Kincey.
DEF: 0-3 INT + 4 MATK + 1%