Not really a guide, but i figured the forum was missing information about the S skills, their passive bonus and which elemental dmg they do. I guess you can discuss which order you think makes the most sense.
Assasin:
https://gyazo.com/2450b2bbd6712c24566f2fc97fa75e65
https://gyazo.com/8daadfd0223b4d2683eebffb959579b2
Sura:
https://gyazo.com/7b67232002fdfdf8be951f3c570dbd7b
https://gyazo.com/06c783144b2acba1fbf50c006728af68
Warrior:
https://cdn.discordapp.com/att…932497678356/s_skills.gif
https://gyazo.com/8c4fd756fe7382681fd8a00657607002
Mage:
https://gyazo.com/aa55383aa3779fac1c91bf977e1a6d69
https://gyazo.com/5697a62d58ef080cc05b35dfcf584e83
Missing skills: enchant damage ( no passive, only increaces crit%), Inferno (would be nice if someone could add), Thunder Wave (would be nice if someone could add)