Guys! Crecentia is for sure a good class, needing some tweaks - which doesn't?
One good thing to keep in your mind is that the game won't be better by boosting every class.
Crecentia in this moment has the highest Weapon Dmg among classes and it can easily reach high vigor and use pets to help itself.
sere gears +20 cant survive in FP [...]
That's not really the truth and It's not just the case of Crecentia. No one of the non-tanking classes can make it solo in FP without a big effort - or without good gears. It's not rare to see in FP Crecentia boosting a whole party, doing it solo. The secret lies in refining your gears and getting good runes but yet I can tell you that PvE balance is one thing on the To do list of Warpportal.
For now, I can tell you that I'm a Wizard and I can make it myself in FP, I'm sure with some effort you will be able too!
[...] as well in WOE. a single skill from sin and warr throwing shield killed crec no sweat effortless. i tried duel also crec v priest my highest dmg =700 and less. while priest can finished me off in no time.
This is not something that only concerns Crecentia. Even a Priest can be one-shotted by a Sin or a Rogue or a Warrior or a Knight. Even a Warrior can be one-shott by a Sin or a Rogue. I wouldn't address this to Crecentia as its weakness. I will tell you that Sin, Rogue, Warrior and Knight's damage are gonna get a tweak somehow to bring things back to reality.
Last thing that you must consider when dueling with somebody else or playing PvP is that players might have an high dmg reduction or increase. That's probably the reason why your damage on the Priest was law: Priest, Wizard, Sorcerer are the classess with lowest defense in game, Crecentia is a leather class, half way between cloth classes and armored one!