I saw a build on YouTube the other day, I think it was FextraLife; it was Magus 10/ EK 10. Currently I’m playing a Cruomancer Wizard 3/ Eldritch Archer Magus 7/ EK 10. I’m going to merge the Lich spellbook with Wizard, and continue it with EK (caster level 22). Magus gives me Martial Weapons, Range Spell Combat, Ranged Spell Strike, Perception and Persuasion skills. And access to Opposition School spells (Divination and Illusion).
Feats: SF Necromancy, GSF Necromancy, SF Evocation, SF Conjuration, Augment Summoning, Superior Summoning, Point Blank Shot, Precise Shot, Spell penetration, Greater Spell Penetration, Empower Spell, Reach Spell, Combat Casting, Weapon Focus, Weapon Specialization, Greater Weapon Focus. For Magus Arcana, Hasted Assault + ?. Lich Feats definitely that improved Mage Armor, + ?.
The basic concept is that I use a lot of summons and undead. I buff them, debuff enemies, use battlefield control, and hit them with range touch spells and arrows. BAB= +16, +11, +6, +1.
I may even dump Wizard 3, for Crossblooded Sorcerer 1 (Undead/ Water Elemental).