Here's an example warforged pure wizard archmage, main focus in necromancy with secondary focus in conjuration and the Web SLA (but no Necro SLAs -- I think the SP is more valuable).
Code:
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Warforged Archmage
Level 20 True Neutral Warforged Male
(20 Wizard)
Hit Points: 272
Spell Points: 1910
BAB: 10\10\15\20
Fortitude: 12
Reflex: 16
Will: 10
Starting Ending Feat/Enhancement
Abilities Base Stats Base Stats Modified Stats
(32 Point) (Level 1) (Level 20) (Level 20)
Strength 14 14 14
Dexterity 8 8 8
Constitution 18 20 22
Intelligence 18 25 30
Wisdom 6 6 6
Charisma 6 6 6
Tomes Used
+1 Tome of Intelligence used at level 3
+2 Tome of Constitution used at level 7
+2 Tome of Intelligence used at level 7
Starting Ending Feat/Enhancement
Base Skills Base Skills Modified Skills
Skills (Level 1) (Level 20) (Level 20)
Balance 1 10 10
Bluff -2 -2 -2
Concentration 8 29 33
Diplomacy -2 9 9
Disable Device n/a n/a n/a
Haggle -2 1 1
Heal -2 -2 -2
Hide -1 -1 -1
Intimidate -2 -2 -2
Jump 4 12 12
Listen -2 -2 -2
Move Silently -1 10 10
Open Lock n/a n/a n/a
Perform n/a n/a n/a
Repair 4 10 10
Search 4 10 10
Spot 0 9 9
Swim 2 2 2
Tumble 1 1 1
Use Magic Device 0 9 9
Level 1 (Wizard)
Skill: Balance (+2)
Skill: Concentration (+4)
Skill: Jump (+2)
Skill: Spot (+2)
Skill: Tumble (+2)
Skill: Use Magic Device (+2)
Feat: (Wizard Bonus) Extend Spell
Feat: (Selected) Toughness
Level 2 (Wizard)
Skill: Concentration (+1)
Skill: Move Silently (+2)
Level 3 (Wizard)
Skill: Balance (+1)
Skill: Concentration (+1)
Skill: Jump (+1)
Feat: (Selected) Mental Toughness
Level 4 (Wizard)
Ability Raise: INT
Skill: Concentration (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Skill: Use Magic Device (+1)
Level 5 (Wizard)
Skill: Balance (+1)
Skill: Concentration (+1)
Skill: Jump (+1)
Skill: Use Magic Device (+1)
Feat: (Wizard Bonus) Spell Focus: Necromancy
Level 6 (Wizard)
Skill: Concentration (+1)
Skill: Diplomacy (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Feat: (Selected) Maximize Spell
Enhancement: Racial Toughness I
Enhancement: Improved Concentration I
Enhancement: Improved Concentration II
Enhancement: Acid Manipulation I
Enhancement: Frost Manipulation I
Enhancement: Storm Manipulation I
Enhancement: Force Manipulation I
Enhancement: Repair Manipulation I
Enhancement: Wizard Energy of the Scholar I
Enhancement: Wizard Energy of the Scholar II
Enhancement: Wizard Intelligence I
Enhancement: Wizard Wand and Scroll Mastery I
Enhancement: Warforged Constitution I
Enhancement: Warforged Healer's Friend I
Enhancement: Warforged Inscribed Armor I
Enhancement: Wizard Archmage I
Enhancement: Archmage Spell Mastery I: Necromancy
Level 7 (Wizard)
Skill: Balance (+1)
Skill: Concentration (+1)
Skill: Jump (+1)
Skill: Spot (+1)
Level 8 (Wizard)
Ability Raise: INT
Skill: Concentration (+1)
Skill: Diplomacy (+1)
Skill: Move Silently (+1)
Skill: Use Magic Device (+1)
Level 9 (Wizard)
Skill: Balance (+1)
Skill: Concentration (+1)
Skill: Spot (+1)
Skill: Use Magic Device (+1)
Feat: (Selected) Insightful Reflexes
Level 10 (Wizard)
Skill: Concentration (+1)
Skill: Diplomacy (+1)
Skill: Jump (+1)
Skill: Move Silently (+1)
Feat: (Wizard Bonus) Spell Focus: Conjuration
Level 11 (Wizard)
Skill: Balance (+1)
Skill: Concentration (+1)
Skill: Jump (+1)
Skill: Use Magic Device (+1)
Level 12 (Wizard)
Ability Raise: INT
Skill: Concentration (+1)
Skill: Diplomacy (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Feat: (Selected) Greater Spell Focus: Necromancy
Enhancement: Racial Toughness II
Enhancement: Improved Concentration III
Enhancement: Glacial Spellcasting I
Enhancement: Deadly Ice I
Enhancement: Frost Manipulation II
Enhancement: Frost Manipulation III
Enhancement: Frost Manipulation IV
Enhancement: Wizard Energy of the Scholar III
Enhancement: Wizard Intelligence II
Enhancement: Warforged Constitution II
Enhancement: Wizard Archmage II
Enhancement: Wizard Archmage III
Enhancement: Archmage Secondary Spell Mastery I: Conjuration
Enhancement: Conjuration I - Grease
Enhancement: Conjuration II - Web
Level 13 (Wizard)
Skill: Balance (+1)
Skill: Concentration (+1)
Skill: Jump (+1)
Skill: Use Magic Device (+1)
Level 14 (Wizard)
Skill: Concentration (+1)
Skill: Diplomacy (+1)
Skill: Move Silently (+1)
Skill: Spot (+1)
Level 15 (Wizard)
Skill: Balance (+1)
Skill: Concentration (+1)
Skill: Spot (+1)
Skill: Use Magic Device (+1)
Feat: (Wizard Bonus) Quicken Spell
Feat: (Selected) Spell Penetration
Level 16 (Wizard)
Ability Raise: INT
Skill: Concentration (+1)
Skill: Diplomacy (+3)
Skill: Move Silently (+1)
Level 17 (Wizard)
Skill: Balance (+1)
Skill: Concentration (+1)
Skill: Jump (+1)
Skill: Spot (+1)
Skill: Use Magic Device (+1)
Level 18 (Wizard)
Skill: Concentration (+1)
Skill: Diplomacy (+2)
Skill: Jump (+1)
Skill: Move Silently (+1)
Feat: (Selected) Heighten Spell
Enhancement: Racial Toughness III
Enhancement: Improved Concentration IV
Enhancement: Frost Manipulation V
Enhancement: Frost Manipulation VI
Enhancement: Frost Manipulation VII
Enhancement: Wizard Spell Penetration I
Enhancement: Wizard Energy of the Scholar IV
Enhancement: Wizard Intelligence III
Enhancement: Wizard Wand and Scroll Mastery II
Enhancement: Wizard Archmage IV
Enhancement: Wizard Archmage V
Enhancement: Archmage Spell Mastery II: Necromancy
Level 19 (Wizard)
Skill: Balance (+1)
Skill: Concentration (+1)
Skill: Diplomacy (+1)
Skill: Spot (+1)
Skill: Use Magic Device (+1)
Level 20 (Wizard)
Ability Raise: INT
Skill: Concentration (+1)
Skill: Haggle (+3)
Skill: Move Silently (+1)
Feat: (Wizard Bonus) Empower Spell
Enhancement: Wizard Master of Magic
Enhancement: Wizard Improved Maximizing I
Enhancement: Wizard Spell Penetration II
Feat order:
There are some things there you may want to change. I wait until 20 to take Empower, for instance -- depending on playstyle, you may want that earlier. (Personally, I usually keep it turned off -- just too expensive most of the time.)
Feat alternatives/swaps
There are 2 important feats that are missing: Greater Spell Penetration and Greater Spell Focus: Conjuration. There are also two obvious candidates for a swap: Extend and Insightful Reflexes. Personally, I find Extend invaluable at low levels, but much less so at cap. I would almost certainly swap Extend out for Greater Spell Penetration at high level.
A lot of people don't much care for Insightful Reflexes, but for me the survivability of a high reflex save is more valuable than +1 DC on Web. I would keep that one. But, if you disagree, then you could take Greater Spell Focus: Conjuration in place of Insightful Reflexes (actually, due to the order, you'd need to take GSF: Necromancy in place of Insightful Reflexes, and then take GSF: Conjuration in place of GSF:Necromancy at level 12).
Enhancement Alternatives
This is wide open, and you should change this around a lot as you level. It's easy and nearly free, and the best options are different at different levels. The ones I've listed are intended as endgame options. You will certainly want points in fire at the mid levels for the glorious hey day of wall of fire.
Even at end game, there's room to change stuff around. For example, I didn't take any Necromancy SLAs, preferring the extra SP. The levels 4 and 5 SLAs are quite nice (Enervation and Waves of Fatigue), but I don't think they're worth the 375 SP cost -- you may feel differently, and that's totally fine.
On the other hand, I don't know how much I care about the 75 SP from Archmage V -- I might suggest dropping it, in which case you can also drop Energy of the Scholar IV and Improved Concentration IV. That's a total cost of 105 SP and a savings of 6 AP, which you could then use to significantly spec into a second elemental line (acid, probably, to take advantage of your high Conjuration DC) or one of the reduced SP metamagic lines, or 3 tiers of Subtle Spellcasting, if you're having aggro problems.
Other types of archmage
You'll want to change this if you go for a different type of archmage. For enchantment, it's pretty much as simple as swapping Necro for Enchantment in the spell focuses (and probably swapping conjuration for necro -- instant killing is so nice that an enchantment/necro archmage is a lot more appealing than an enchantment/conjuration or enchantment/evocation).
For evocation, it's more significant. You'll play this more like a lower-DPS, more versatile sorcerer. Enhancements will be significantly different, and you'll probably want more investment in the force line, and maybe even a third line. You'll care much less about spell penetration, and much more about damage. You'll have to swap your necro spell focuses to evocation, but your secondary should probably still be conjuration -- heightened web is really nice and doesn't depend on spell pen. You'll want to take Empower much earlier than I did -- it's an expensive metamagic for most standard spells, but a virtually essential one for evocation SLAs. You might consider dropping Spell Penetration entirely. You'll almost certainly want to take the arcane bolt/blast SLAs, along with the evocation ones (at least up to tier 3). (I should reiterate one more time: currently an evocation archmage is not nearly as strong a DPS choice as a savant sorcerer. It's an option, but not the strongest one available to you.)