How is the Warden, a melee class, released in Feb 2009, based upon the DOTA2 Invoker, a magic user, when the development of DOTA 2 began in 2009 and was released in 2013?
One could think you have your dates mixed up.
You are ignoring dota1 https://dota2.fandom.com/wiki/Version_6.10. Dev also confirmed that invoker was inspiration for warden, even tho I have learned that recently I have always compared ward to invoker. Tho where one got improved over time warden is stuck in quite bad state gameplay wise since release it seems.