Hello,
First of all if you want to build a skill critical rate/dmg tyrr it's viable in the game nowadays and especially for pvp purposes,
In order to get urself a strong skill critical rate you will need to get
Cancer agathion charm max 10% - P skill critical rate artifact 10% - 10% skill critical rate from AP - Kain skill critical rate SA 15% - An augment for p skill critical rate works too (15%)
In this patch, and with all these items, Focus skill enchant route is viable.
DEX does not affect Skill critical rate at all , what you need is STR for the patk. DEX is completely useless.
When you have all of those items, you will probably crit 1/4 1/5 of skills, and more than 60-70% of ur infinity strike/sonic star will crit.
If u build all that p skill critical rate, be sure to build alot of p skill critical dmg also, jewels, augment,SA, circlet, cloak etc.
Personally nowadays i hit ppl for 2-3k dmg, but when a crit happens it jumps to 20-25k which is a huge diff, with the right setup u can do alot of damage.
P.crit rate = Normal atk crit rate and not skills crit rate.
That pskill crit rate/dmg build will only works for you if you have a strong wallet to spend 1 Trilion + on gears, otherwise it will be plain useless and u should consider going full pve mode with pcrit dmg/patk to farm and build urself step by step annother tyrr build.