you are correct .... you need to have a Patron ... thats why i listed other Patrons in addition to Lirr :
other Patrons that can work with this:
Syret(CG)(Illumian) Chaos,Sun,Travel (Mace)
Haku(CG)(Sandstorm)Air,Chaos,Good,Protec tion,Travel(Scimitat)
Zoser(CN)(Sandstorm)Air,Chaos,Destructio n,Sand,Summer(Spiked Chain)
Bast(CG)(Egyptian)Chaos,Destruction,Prot ection,Strength,War(Spiked Gauntlet)
Nephthys(CG)(Egyptian)Chaos,Good,Protect ion,Repose(Mace)
Nanna-Sin(CG)(Babylonian)Chaos,Luck,Good(Battl e Axe)
Utu(CG)Babylonian)Chaos,Fire,Good,Sun(Sc imitar)
Lirr(CG)(Complete Divine-Core)Chaos,Good,Knowledge,Magic,Travel(R apier)
Tritherion(CG)(Complete Divine-Core)Chaos,Good,Liberation,Summoner(Spea r)
Kord(CG)(Core)Chaos,Good,Luck,Strength(G reat Sword)
Warlock 1 gives a least Invocation ... so it will qualify for Eldritch Disciple
Human is also a great choice for this build