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Lothric long sword blessed has a C Dex S faith scaling at +10. I'm not one for trying to get the most OP weapon. So this one works very well. Blessed weapons are definitely slept on due to the meta. Same as hollow builds. Only builds I use lol
Other infusions almost always provide more AR (sometimes more than double), and this makes blessed infusion worthless for most situations excluding parry shields. I mean, 2hp/sec is marginal benefit considering you bricked your weapon. However, there are few exceptions, where blessed gem is obviously the best choice (providing you have high faith):
-Lothric Knight Greatsword
-Drakeblood Greatsword
-Dragonslayer's Axe
-etc.
For example, Blessed Lothric Knight Greatsword (24/16/40 str/dex/fth) has 655 AR. At 60 faith it reaches 700. Remember: blessed gem increases >innate< lightning damage the most effectively. DON'T infuse other weapons! S scaling worth nothing if the base damage is halved.