Yorick is (in this Guide) an amazing demage dealer + he can stay long in fights
the main demage is yourQ-skill
for long langing u need much mana for spamming your ghoul´s improtant there is theE-skillthis ghoul heal you by atacking enemys
The W-skillis an AoE and slows all enemys he hits
Finaly your ultimate you will reborn for a short time to end what you begun

Yes the Item build I said spamm your ghouls that means mana much mana at the start you will see you need that mana potions and not healt potions for herrezt u can take the E-skill after Manamune you will not have so huge problems with mana somtimes steal the blue buff is not so bad
Trinity Force? Yes! really important for your q skill you deal much demage can somtimes slow you enemys and more movement speed Hydra life steal + AoE demage sunfire cape for more life and armor and at last magic resist + movement speed

+ High demage
+ Speedy
+ can nice changed to tanky

- Need Much mana
- silence is your death
- often get focused