Now, for my actual build:
Arcanist 20
Str 8, Dex 14, Con 16, Int 20, Wis 8, Cha 12
Traits: Intelligent, Shadow Born (Arcane Nature)
H: Skill Focus (Concentration)
1st: Tactics of the Mind 1 (Int instead of Str or Dex to attack)
2nd: Beast Mastery 1 (+1 to attack and damage against nonhumanids)
3rd: Beast Mastery 3 (increase saves against special attacks from nonhumanoids)
4th: Venom Mastery 1 (1d2 ability damage, DC 10+Int)
6th: Venom Mastery 2 (increase DC)
7th: Venom Mastery 5 (paralysis instead of ability damage)
8th:
10th: Tactics of the Mind 5 (+Int to AC)
12th:
13th: Venom Mastery 8 (increase DC)
14th:
16th: Tactics of the Mind 9 (+Int to damage)
17th:
18th:
20th:
Schools: Transmutation pirmary, Necromancy secondary, Illusion tertiary
Aspects of Power: Eldritch Dart, Bounding Step, Wound Mending, Greater Eldritch Dart, Greater Wound Mending
It seems Venom Mastery 5 is all I need from that tree. Paralysis is a save or die, which is positively better than, say, 1d6 Con damage. With the exception of dragons, all the creatures in the SRD that are immune to paralysis are immune to poison altogether.
What other feat tree should I pick up?