Ok, let's take it piece by piece:
buzzard said:
War Troll of legend/ Monk 3, Cr: 17
As the War Troll is a monstrous humanoid, you
CAN apply the Monster of Legend template to it, so you're good there.
A War Troll's CR is 12. The Monster of Legend Template (MoL) adds +2 (unless there is errata that I don't know). Adding 3 levels of Monk (assuming you feel it is an associated class), makes that 17. War Trolls advance by character class, so looks like this part is fine.
buzzard said:
Hit Dice 12d8+3d8 + 210 ( 277 hp)
A War Troll has 12d8 Hit Dice + 3d8 for Monk Levels + (Con mod * 15).
A War Troll has a Con of 29, and Monster of Legend adds +10 to that, for a total Con of 39 (a +14 mod). So, 14 * 15 = 210. (You have the creature's Con listed incorrectly as 38).
I believe that the MM uses the average HD roll, so your monster's hp should be 67.5 (round down) + 210 = 277.
So that's correct.
buzzard said:
A War Troll has a 16 Dex (+3 mod), and Monster of Legend adds +6 to that, for 22 Dex (+6 mod). This creature has Gloves of Dexterity +2, for a final Dex of 24 (+7 mod). The War Troll has improved initiative(+4), so we have a total of +11. (You have the creature's Dex listed incorrectly at 28).
A War Troll's base speed is 40ft. I assume the additional +10 is from being a 3rd level monk.
So aside from the Dex issue, we're good here.
buzzard said:
AC: 47 (-1 size, +19 natural armor, +8 dex, +6 wisdom, +3 armor, +2 deflection), Touch 25, flat footed 33
Your creature has the following modifiers to AC:
-1 (for Large Size)
+14 (Natural Armor (War Troll))
+7 (24 Dex)
+4 (15 base Wisdom + 2 from MoL + 2 from Periapt of Wisdom = 19 (+4 mod))
+5 (Natural Armor (MoL))
+3 (Bracers of Armor +3)
+2 (Ring of Protection +2)
= 44, touch 22, Flat footed 33
buzzard said:
Base Attack/grapple: +15/+34
A War Troll Monk 3 has a BAB of +14.
Your creatures grapple check has the following modifiers:
+4 (Large creature)
+4 (Improved Grapple)
+14 (BAB)
+15 (41 Str, you have the creature's strength listed incorrectly as 42)
= 37
buzzard said:
Your creature has the following attack modifiers:
+14 (BAB)
+15 (41 Str)
+1 (Weapon Focus Claw)
= 30
And you deal 1d8+15 damage.
buzzard said:
Full Attack: 2 claws +32 melee (1d8+16) and bite+30 melee (1d6+8); or masterwork composite longbow +22/+16/+12 (2d6+10/x3)
Your Full Attack Line should read as follows:
Full Attack: 2 claws +30 melee (1d8+15) and bite +27 melee (1d6+7); or masterwork composite longbow +22/17/12 (2d6+10/x3)
I'm assuming you are still using the Longbow that comes with the War Troll (a +10 Str mod mighty bow). If so, you should add it to the creatures equipment.
You could also add your unarmed strikes in this line, and as long as you aren't flurrying, you could get 3 unarmed strikes with full strength bonus and 2 claws and a bite as secondary natural attacks (-2 on attack bonus and + 0.5*Str bonus).
So your Full Attack could look like this:
Full Attack: Unarmed Strike +29/+24/+19 melee (1d8+15) and 2 claws +28 melee (1d8+7) and bite +27 melee (1d6+7)
buzzard said:
Space/Reach: 10ft./10 ft.
This one is correct.
buzzard said:
Special Attacks: Dazing Blow DC 30, Frightful presence DC 17
The DC for Dazing Blow is correct, but the DC for Frightful presence is 10 + 1/2 HD (15/2 = 7.5, rounded down) + Cha mod. So the DC = 10 + 7 + 2 = 19.
You should also list Flurry of Blows here, if you want to remember it.
buzzard said:
Special Qualities: Damage reduction 5/adamantine, darkvision 90 ft., low-light vision, regeneration 9, scent, spell resistance 20, immune to acid, spell turning, evasion, still mind
DR 5/adamantine, darkvision 90ft., low-light vision, regeneration 9, scent, SR 20 all come from the War Troll, and are correct.
Evasion and still mind come from Monk, and are correct.
You get two special qualities from MoL, and you chose Reflective Hide (spell turning) and Immunities. Immunities grants you immunity to two of the listed effects, not just one. You chose acid as one, and (provided there is no errata on the subject) you may choose one more from the following list:
electricity, fear, poison, polymorphing, or mind-affecting effects.
buzzard said:
Saves: Fort +27, Ref +25, Will +24
Your creature has the following mods to its saves:
Fort: +14 (Con) + 3 (Monk) + 3 (MoL) + 4 (War Troll base) = 24
Ref: +7 (Dex) + 3 (Monk) + 3 (MoL) + 8 (War Troll base) = 21
Will: +4 (Wis) + 3 (Monk) + 3 (MoL) + 2 (Iron Will) + 8 (War Troll base) = 20
I assume that the Cloak of Protection you list is actually a Cloak of Resistance +3? If so, add 3 to each of those for a final Fort +27, Ref +24, Will +23.
buzzard said:
Abilities: Str 42, Dex 28, Con 38, Int 15, Wis 22, Cha 12
A 15 HD War Troll Monster of Legend with the listed gear has the following Ability Scores:
Str: 31 (war troll) +10 (MoL) = 41
Dex: 16 (war troll) +6 (MoL) +2 (gloves of dex +2) = 24
Con: 29 (war troll) +10 (MoL) = 39
Int: 8 (war troll) +2 (MoL) = 10
Wis: 15 (war troll) +2 (MoL) +2 (periapt of wisdom +2) = 19
Cha: 10 (war troll) +4 (MoL) = 14
buzzard said:
Skills: Listen +22, Spot +22, Jump +32, Knowledge (history) + 4, tumble +21
Feats: Alertness, Improved Initiative, Iron Will, Multi-attack, Weapon focus(claws); power attack, acrobatic, improved unarmed strike, improved grapple, combat reflexes, hold the line
A War Troll starts with the following skills and modifiers:
Listen: +2 (Wis) +2 (Alertness) +7 ranks
Spot: +2 (Wis) +2 (Alertness) +8 ranks
Your new stats bring those up to:
Listen: +4 (Wis) +2 (Alertness) +7 ranks = 13
Spot: +4 (Wis) +2 (Alertness) +8 ranks = 14
Your Monk levels will get you 12 skill points to spend ((4+0 (int mod))*3 = 12) on monk class skills. You have spent far too many ranks on skills, including Knowledge(History), which is a cross-class skill.
A War Troll starts with the following feats:
Alertness, Improved Initiative, Iron Will, Multiattack, Weapon Focus (you've chosen claw instead of greatsword)
Monk gets you Improved Unarmed Strike, Improved Grapple, and Combat Reflexes.
MoL gives you Improved Initiative and Multiattack as bonus feats (I'm not sure if you are allowed to take different feats if you already have these. I suppose you could say that this War Troll had two other feats instead of Imp. Init and Multiattack.
Your 15th HD gets you one feat.
You have Power Attack, Acrobatic, and Hold the Line. If we assume you swapped around the War Trolls beginning feats for Power Attack and Acrobatic, your 15th HD feat would be Hold the Line and everything is ok.
buzzard said:
Alignment: LE
Equipment: Cloak of protection +3, bracers of armor +3, +2 ring of protection , +2 gloves of dexterity, periapt of wisdom +2
War Trolls are listed as usually LE in alignment.
Equipment for a 17th level NPC (CR 17) is 100,000gp
Your creatures gear comes to 35,400gp