Ok here we go @dmhamilt
TL/DR with only lvl 4 gems and not all that OP gear plus rogue c1 you can critical hit a lot with low dex.
I will share my personal stats for my lvl 200 here:
48 points used into dex
48 points used into con
all the remainig points into STR.
107 critical rate. using the critical chance formula (107 - 101) x 42/by my lvl (200) = 1,26% critical chance against World boss Dullahan. Well thats with no items or gems.
With 4 level 4 gems (2 gems in main hand weapon, 2 in sub weapon) as it shows here : http://toswiki.treeofsaviorgame.com/item/gem
28 (14x2) + 36 (18x2) = 64 (I have only 2 non used level 4 green gems)
Karacha dagger bonus = 11 (using +10 dex neck, still dont have it)
Hair acessory = 12 (already got it)
Total 87.
Now with only Level 4 gems, +11 dex from sub weapon and +12 from hair acessory the critical chance on World boss Dullahan is 19,53%. lol
Now, using sneak hit lvl 5 (+70%), I should crt hit him at least on 70% of time - if I attack him from behind.*
*PS: Looks like Critical resist reduces even the flat +70% bonus from sneak hit, but I never saw a formula to that.
Edit: PS 2: I didnt use any extra points from quests, only the STR bonus from ranks… anyway any extra point will go to STR.