Dex build

[eager nacelle]

Irithyll straight sword or lothric knight sword
Which one should I upgrade

[worthy summit]

broadsword

[eager nacelle]

Scaling

[worthy summit]

?

[thorn sand]

depends on you

irithyll procs frost and as wikis say deals more damage

but you can infuse and buff lothric

if I were you I would upgrade both ifyouhave the materials

[mossy ocean]

Irithyll ss is a quality weapon
(And a mid one btw)

Lks works best on dex and is decent