A superlative puzzle?

[bonanova]

It's Saturday night, and being a puzzle writer I have no social life. 
So I make a list of a dozen things: 

1. A destroyer of compasses
2. A massive herbivore
3. A peculiar behavior
4. A portrayal, as [if] perfect
5. A student of obfuscation
6. A way for water to disappear
7. An earth scientist
8. Some bilious organs
9. Some cell phones
10. Some foot doctors
11. Some groups of possibly heterogeneous things considered as a whole
12. Some people who study races

I lazily let my pencil wander down through the list, three times,
thus dividing each word into four pieces of lengths 2, 3, 4: 

AG  BL  GE  GR  ID  PT  VA [7]

ACK  ADD  AGN  ALI  ASY  BER  CRY  DEM  EDI  ERS  
ETH  ETI  GAL  HIP  HOP  IDE  IST  ION  IOS  IZA
LBL  MUS  NOL  OGI  OPH  ORT  OTA  POP  POR STS
STS  YSI  ZAT  ZER  [34]

CIST  EGAT  IONS  OLOG  RIES  TION  YNCR  [7]

Finally, I notice that if I take the 2nd letter of each word, I get something appropriate for this forum.

What is it?

[The words are nouns of equal length, singular or plural as the clues indicate.]

EDIT: Added a missing STS piece.
_________________
_{Vidi, vici, veni.}

[Zag]

So the answers will all have to be 12 letters, to use up the letter sets below.

1. A destroyer of compasses
2. A massive herbivore
3. A peculiar behavior
4. A portrayal, as [if] perfect
5. A student of obfuscation (cryptographer is 13 letters.)
6. A way for water to disappear ELECTROLYSIS (can't make it) (Evaporation and sublimation are each only 11 letters.)
7. An earth scientist GEOSCIENTIST (can't make it from the letters below.)
8. Some bilious organs GALLBLADDERS
9. Some cell phones
10. Some foot doctors ORTHOPEDISTS
11. Some groups of possibly heterogeneous things considered as a whole
12. Some people who study races

I lazily let my pencil wander down through the list, three times,
thus dividing each word into four pieces of lengths 2, 3, 4: 

AG  BL  GE GR  ID  PT  VA [7]

ACK ADD AGN ALI ASY BER CRY DEM EDI ERS
ETH ETI GAL HIP HOP IDE IST ION IOS IZA
LBL MUS NOL OGI OPH ORT OTA POP POR
STS YSI ZAT ZER [34]

CIST  EGAT  IONS  OLOG  RIES  TION  YNCR  [7]

[bonanova]

That's the idea. Like this one from a while back:

http://www.greylabyrinth.com/discussion/viewtopic.php?p=445681
_________________
_{Vidi, vici, veni.}

[Suspence]

DEM AGN ETI ZER - 1. A destroyer of compasses
HIP POP OTA MUS2. A massive herbivore
ID IOS YNCR ASY - 3. A peculiar behavior
IDE ALI ZAT ION - 4. A portrayal, as [if] perfect
CRY PT OLOG IST - 5. A student of obfuscation
VA POR IZA TION - 6. A way for water to disappear
GE OPH YSI CIST - 7. An earth scientist
GAL LBL ADD ERS - 8. Some bilious organs
BL ACK BER RIES - 9. Some cell phones
ORT HOP EDI STS - 10. Some foot doctors
AG GR EGAT IONS11. Some groups of possibly heterogeneous things considered as a whole
ETH NOL OGI STS - 12. Some people who study races

I notice that if I take the 2nd letter of each word, I get something appropriate for this forum.

EIDDRAEALRGT???
_________________
I hate people who try to write interesting things in their signature.

[bonanova]

Note. I added a missing STS piece in the OP.
_________________
_{Vidi, vici, veni.}

[Elethiomel]

A great riddle!