Almost same to Beginner guide.

Recommend Character for Hard mode solo run

Shuyan Hou
Pros
Easy to hit and run.
Long invincible time.
Short attack delay.
Short cool down.

Cons
DPS is little low.

My opinion
Easiest way for hard solo play.
If you can use invincible time well,
Don't need blood stealing items.
But, taking time little long with low DMG.
So, Need make up for DMG.
Recommend pick cool down decrease items.

Recommend items

Passive

Qian Kun Mirror

[Bloodstealing]There is 50% chance to regenerate 5 HP when hitting the enemy
[Multipel Obtain]Gain 4 bonus per stack. Maximum stacks: 4

Qian Kun Mirror is always right.

Ring of Sheen

[CD Time]CD Time decreases by 10%
[Multiple Obtain]gain 2% bonus per stack. Maximum stacks: 4

Cool down decrease for more often getting invincible time.


Lphone

[HP↓ & CD Time↓]CD Time decreases by 10% and the max HP decreases by 20%
[Multiple Obtain]Gain 3% bonus per stack. Maximum stacks: 4

Cool down decrease for more often getting invincible time.
Take care about decrease max HP.

Coin-made Sword

[Blast ATK]Deal blast damage equivalent to skill's 100% within 2-meter radius of area when killing the enemy
[Multiple Obtain]Gain 30% bonus per stack. Maximum stacks: 4

Good for bunch of enemies.

DragonHorn Bugle

[Tornado]When attacking, there is 7% chance to generate 2 tornadoes and deal 25% of skill DOT to enemis for 6s
[Multiple Obtain]Increases 1s per stack. Maximum stacks: 4

Good for making enemies flinching.

Active Item

Ice Spirit

[Ice Attack]Summon 6 ice cones to attack the enemy, 35 DMG per bullet and frozen the target for 2 seconds. Need Power: 150
[Multiple Obtain]30 DMG per stack. Maximum stacks: 9

Good for freezing enemies, good for fight with boss.

Cross Fire Spell

[CrossFire]Summon a cross fire rotate for 8s. To cause 60 DMG on enemies & have chance to flame them. Need Power: 150
[Multiple Obtain]Increases 60 DMG per stack. Maximum stacks: 9

Good for all enemies.

Recommend Item Tree(Priority)

1. Cool down decrease item
2. Qian Kun Mirror
3. Elemental Mirror
+ Elemental attack items(Include Active item)
4. Increase DMG item

Sometimes can't find Mirrors in early stage.
Then, pick elemental attack items.
Maybe can be find Mirrors in next stage.
Or abandon Mirrors and just fill YuJing Bottle from another Active items.

If you found Elemental mirror, pick items with same elemental.

Best is wind, wind mirror + DragonHorn Bugle can heal fast and many.
Also, DragonHorn Bugle is powerful with just single item.
But, wind Active item is not good for healing.

Fire also good, fire mirror + PurpleCloud Flame Seal can heal fast and many.
But, It's very short distance attack.
Fire Active item is good for healing.
Recommend Cross Fire Spell.
Cross Fire Spell is powerful with just single item.

Earth also good, earth mirror + earth attack item can heal many.
CaveSpirit Crown and DragonRider Seal is multiple attack.
So, can heal many times with taking time.
Earth Active item is not much good for healing.

Ice is so so, ice mirror + ice attack item can heal.
All ice attack items can only single attack.
So, can heal a little bit.
Ice Active item is good for healing.
Frost Rune and Ice Spirit is multiple attack.
Frost Rune is more good for healing.
But Ice Spirit is more good for beat enemies.

Lightning is little bad, brass mirror + lighting item can heal.
Lightning attack items can multiple attack.
But, lightning balls be disappear when after attack enemies.
So, not much good for healing with many enemies.
Thunder Seal is good for healing.
But, need close to enemy for hit all lightning balls on enemy and
Need upgrade many time for more lightning balls.
Not much recommend brass mirror.
But, sometimes unavoidably need to using this.

I will never recommend items in guide.
Because, developers gonna nerf items come up in guide.
Sorry for making nerf core items.