Some tests done on precision:
Test method:
Use A2 casters (mainly rus thunder priests) to cast lightning bolt against single size 6 target
Range: ~40 tiles (using smallest formation possible for troops with farthest caster at range 40)
Have casters scripted as: 1 x Hold + 4
1) x Lightning Bolt
During the hold turn, buffs were cast by other supporting mages
5 battles of 40 casts for thunder priest
7 battles of 30 casts for sidhe lords
Hits were calculated by checking the targets battle log
PREC 10 (Thunder priest)
1: 5/40
2: 1/40
3: 2/40
4: 4/40
5: 1/40
SUM: 13/200 = 6.5%
PREC 15 (Thunder priest + Wind guide)
1: 1/40
2: 2/40
3: 4/40
4: 6/40
5: 5/40
SUM 18/200 = 9%
PREC 19 (Thunder priest + Wind guide + 4 x precision Bless)
1: 8/40
2: 5/40
3: 9/40
4: 4/40
5: 3/40
SUM 29/200 = 14.5%
PREC 24 (Thunder priest + Wind guide + 4 x precision Bless + eye of aiming)
1: 4/40
2: 4/40
3: 2/40
4: 2/40
5: 2/40
SUM 14/200 = 7%
PREC 23 (Sidhe Lord + Wind guide + 4 x precision Bless)
1: 4/30
2: 4/30
3: 1/30
4: 6/30
5: 3/30
6: 4/30
7: 4/30
SUM 26/210 = 12.3%
notes:
the spread pattern got noticeably smaller with higher precision
in earlier test with troop, mages seemed to top most units