Enemy defense and evasion (also from gobli, its also on the wiki under Defense, just putting the info here since I'll be using it)
Defense: (f(Lv, Race Defense Rank) + 8 + VIT/2 + Job Traits) * Race Trait
Code:
Rank\Lv Lv1-50 Lv51+
A 6+[(Lv-1)*3.0] 153+[(Lv-50)*5.0]?
B 5+[(Lv-1)*2.9] 147+[(Lv-50)*4.9]?
C 5+[(Lv-1)*2.8] 142+[(Lv-50)*4.8]
D 4+[(Lv-1)*2.7] 136+[(Lv-50)*4.7]?
E 4+[(Lv-1)*2.5] 126+[(Lv-50)*4.5]
Race Defense Rank is typically C. Crawlers are E, Greater Birds are B.
Race Trait is typically 1. Bugards, buffaloes and antlions are approx 1.2 (1+51/256)
Verification
I used the Enkidus I already mapped VIT for. I got their Def and Eva through /c and gear swap spam before I started doing those gorget tests last week.
(f(Lv, Race Defense Rank C) + 8 + VIT/2 +
10) * 1
77. 271 + 8 + 38 +
10 = 327
78. 276 + 8 + 38 +
10 = 332
79. 281 + 8 + 40 +
10 = 339
80. 286 + 8 + 40 +
10 = 344
/c defense results were 327, 332, 339 and 344, exact match. That supports other data further.