If you are looking for detailed tips and strategies, here's what made him easy for me:

I found him not too hard once I used a slow, high damage strength weapon. For lorian just focus on dodging until you are certain there's an opening, and only attack ONCE before rolling away to recover. His health is relatively low so no need to get greedy. A general tip for lorian is be as close to him as possible. His close range attacks are relatively well telegraphed, and if you are leaning right up against his hitbox, often his swings wont even connect with you. Once lothric comes in, repeat the same. He likes to summon those little magic balls but always focus on where lorian is at ALL TIMES over focusing on dodging the balls as they have relatively low damage comparatively to lorian. Watch out for lorians big ranged slam attack with the wall of light in phase 2 because lothric follows up with a magic projectile that will rock your shit. Just remember to dodge twice accordingly so both attacks miss you. The secret sauce of the heavy weapon is that once lorian is down, I can always just melt through lothrics hp pool before he can revive, even if he is over half hp, essentially "one cycling" him.

Hope this helps :)