Added (2008-04-07, 2:48 Pm)
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ask him what he have
i know part of them and i know what of his ittem trade from other ppl
i know that he have 2 DB 1 Draconic set 1 AQ 1 AS +16 ...
twohalf trade AS+16 DB
darksofter trade drac set
i think that he have zaken too but i am not sure..
ask him

Oke will continue) special 4 u
1st ur question
Damage = Power*[square root(MAtk*SS)]*K/MDef
SS - 1, if u don't use, 2 - for spiritshot, 4 - for blessed spiritshot
K - constant =91

And now about M.atk:
M.Atk. = (Weapon M.Atk.*Level Modifier*Level Modifier*INT Modifier*INT Modifier*Armor Bonus*M.Def. Bonus*Buffs)+Mastery Modifier+Weapon Mastery+Weapon Bonus+Heroic Berserker
The final M.Atk. is rounded down.

Weapon M.Atk.
If you have no weapon equipped, use 6.

Level Modifier
(level+89)/100

INT Modifier:

INT modifier INT Modifier
6 0.61 30 0.97
7 0.62 31 0.99
8 0.63 32 1.01
9 0.64 33 1.03
10 0.65 34 1.05
11 0.67 35 1 .07
12 0.68 36 1.10
13 0.69 37 1.12
14 0.71 38 1.14
15 0.72 39 1.16
16 0.74 40 1.19
17 0.75 41 1.21
18 0.77 42 1.23
19 0.78 4 3 1.26
20 0.80 44 1.28
21 0.81 45 1.31
22 0.83 46 1.34
23 0.85 47 1.36
24 0.86 48 1.39
25 0.88 49 1.42
26 0.90 50 1.45
27 0.9 2 51 1.47
28 0.94 52 1.50
29 0.95 53 1.53

Mastery Modifier:
Use this only if you have at least 1 level of Weapon Mastery for mystic classes.
Mastery Modifier = 0.17*level modifier*level modifier*INT Modifier*INT Modifier*Weapon M.Atk.

Weapon Bonus:
All SAs add a decimal value to your M.Atk. despite what the in game description says.

type modifier
Empower
Ecliptic Sword 26
Elemental Sword 30.76
Imperial Staff 60.09
Stick of Eternity 24.59
Sword of Whispering Death 24.59

Magic Power
Ecliptic Axe 112
Ecliptic Sword 112
Elemental Sword 153.28
Flaming Dragon Skull 167
Mysterious Sword 75
Nirvana Axe 99.39
Sword of Miracles 167.02
Sword of Whispering Death 99.39
Wizard's Tear 139

Armor Bonus:
The in-game descriptions for these bonuses are inaccurate.

type modifier
Knowledge set 1.1025
Zubei robe set 1.1025
Nightmare robe set 1.08
Major Arcana set 1.17

M.Def. Bonus:
type modifier
Necklace of Valakas 1.08

buff lvl modifier
Arcane Lore 1 1.03
Arcane Power 1 1.30
Berserker Spirit 1 1.10
Berserker Spirit 2 1.16
Bright Servitor 1 1.55
Bright Servitor 2 1.65
Bright Servitor 3 1.75
Chant of Victory 1 1.20
Clan Empowerment 1 1.06
Curse of Abyss 1 0.70
Dance of Mystic 1 1.20
Demonic Blade Dance 1-3 0.9
Demonic Blade Dance 4-5 0.85
Demonic Blade Dance 6-7 0.8
Demonic Blade Dance 8-9 0.75
Demonic Blade Dance 10 0.70
Empower 1 1.55
Empower 2 1.65
Greater Empower 3 1.75
Herb of Magic 1 1.75
Necromancy 1 1.03
Prophecy of Water 1 1.20
Rage of Pa'agrio 1 1.10
Rage of Pa'agrio 2 1.16
Soul of Pa'agrio 1 1.75
Wizard Servitor 1 1.20

Heroic Berserker:
buff lvl modifier
Heroic Berserker 1 500

2nd ur question:
it's bullshit, of coz no

3rd:
before C4 yes

And if u like nukers i will tell about magic critical:
magic critical depends from WIT for example with WIT=25 magic critical chance will be 1.02% without any buffs, with WM2 it will be 4.09%, +pow=8.19%, +dance of siren=24.57%, +infinity scepter=37.84%, +valakas=75.69%
For example SH: with pow/siren/wm2 - 40%~, +infinity scepter - 45-50%~, valakas - 60%~, arcana mace with passive wm10 + valakas (without infinity scepter) - ~85-90%.

SPS will have almost 100%
There is without am+vm10 and valakas and have arcana set

Curse of Abyss lowers it to 70.78%

Formula for calculation sonics(old):

(Skill Power + 2 * P.Atk) * (1 + 30% * (Focus Count - 1)) * 70 / Target P.Def
2 * P.Atk - if use SS
For example we have 1000 P.Atk and Target P.Def 700, we want to know damage with 7 charges and with 5 by using Sonic Blaster lv37=1827:
(1827+2*1000)*(1+30%*(7-1)/700=3827*(1+1.8)*70/700=1072
(1827+2*1000)*(1+30%*(5-1)/700=3827*(1+1.2)*70/700=842
Same with all skills which we can charge.

For other skills which don't need to charge this formula:
(Skill Power + 2 * P.Atk) * 70 / Target P.Def

Formulas for calculation charge-skills of Duelist(new):

Lineage II: Chaotic Chronicle - Scions of Destiny
__________________________________________________

Simple skills: ( SS * Duelist P.Atk + Skill Power ) * DS * Duals * CH * 70 / Target P.Def

Charge-skills: ( SS * Duelist P.Atk + Skill Power ) * ( 1 + 0,3 * (Focus Count - 1 ) ) * DS * Duals * CH * 70 / Target P.Def
Focus Count - number of charges.
SS - soulshots modifier, can be 2.04 / 1.00.
DS - variable which at use of skill Duelist Spirit in PVP will be 1.05, at other situations will be 1.00.
Duals - duals bonus in PvP, for A and S duals - 1.05, for heroics - 1.10 ( or 1.05 * 1.05 ), for others - 1.00.
CH - parameter of critical blows, has two meanings 2.00 / 1.00.

Lineage II: Chaotic Throne - Interlude
__________________________________________________

Damage = SS * ( Duelist P.Atk + Skill Power ) * ( 1 + 0,2 * (Focus Count - 1 ) ) * DS * Duals * CH * 70 / Target P.Def
Focus Count - number of charges.
SS - soulshots modifier, can be 2.04 / 1.00.
DS - variable which at use of skill Duelist Spirit in PVP will be 1.10, at other situations will be 1.00.
Duals - duals bonus in PvP, for A and S duals - 1.05, for heroics - 1.10 ( or 1.05 * 1.05 ), for others - 1.00.
CH - parameter of critical blows, has two meanings 2.00 / 1.00.

btw, max I get is 30 WIT on MM :S

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The question is solved