I highly recommend using the skill calculator on the home page, it give an overview of how to place your skill points.
skill calculater.png
skill calc 3.png
Lightning Bolt Level 2
Rain Of Fire Level 2
Meteoric Destroyer Level 2
Thunderer Level 2
and for the last slot I recommend
Delphic Thunder Frenzy(only to fill last slot, I don't recommend any heal because you will get to 5 attacks the the WB will use ultimate attack ,doing millions of damage)


My WB skill tree
skill calculater.png

when you attack the WB as soon as your character animates hit your Lightning Bolt, it will add an extra attack , do this for each attack.
if your character does not animate but still attacks ( with the basic attack{mini fire ball}) quickly hit your Rain Of Fire ,to get the extra attack .


I hope this helps
Darkmagus
server 73
Kyuseishu