Help with Roleplay Backstory and Any Build Tips - Child of Acavna and Amaznen Fighter

[Ariantar]

I could use some ideas/suggestions to round out my next character's backstory. I'm building a Fighter, Child of Acavna and Amaznen (Spellcaster) Archetype.

I saw on Pathfinder Wiki the image of Acavna and noticed she used a spear and focuses on defensive battle. Amaznen focuses on invention and magic. Putting these together, I've built a reach fighter, using a long spear, who also has craft magic weapons/armor, and maxes Spellcraft. The archetype makes using self-enlarge person very easy and viable.

My problem is developing an explanation for following these long-dead gods? Or why this character would do this? I'm drawing a blank and could use some creativity. I thought at first maybe a super inquisitive magic blacksmith - but it just wasn't clicking.

Anyone have any roleplay/backstory thoughts or suggestions to justify this niche archetype?

Also, build below if you have any suggestions/tips:

Movie plot spoiler:

Human Fighter (Child of A&A)
Str 15 (+2 racial); Dex 15; Con 13; Int 14; Wis 10; Cha 8
Heart of the Fey Human Alternate racial. Traits: = Carefully Hidden & Reactionary.
Level 1 - Combat Reflexes & Bodyguard (Human Bonus Feat)
Level 2 - Lose Bonus Fighter Feat - Gain Cantrips (Magic Hand?)
Level 3 - Iron Will; Armor Training
Level 4 - Power Attack (Bonus Fighter Feat); Str + 1; Level 1 Spells
Level 5 - Craft Magic Arms/Armor
Level 6 - Lunge
Level 7 - Arcane Strike (Combos super well w/ Bodyguard using Gloves of Arcane Striking); Level 2 Spells; Advanced Armor Training (Armored Juggernaut)
Level 8 - Dex + 1 (Lose Bonus Fighter Feat)
Level 9 - Toughness?
Level 10 - Additional Armor Training (Heavy Armor Specialist); Level 3 Spells (Haste!)
Level 11 - Pin Down; Advanced Armor Training (Unhindering Shield [mithral buckler])
Level 12 - Con + 1

[VoodistMonk]

I don't think the Child of War Fighter is proficient with 2H weapons... so reach would entail using a whip. Looks like I was mistaken... they just don't get 2H martial weapons... Longspear is good to go. Lol.

If VMC is allowed, then VMC Magus isn't a bad option. Witch and Wizard make decent VMC options, as well. Alchemist, not so much... poison use late in the game is a trap/waste.

Don't forget about Flickering Step/Dimensional Savant... because teleport pounce is cool...

[avr]

The CAA is proficient with simple 2H weapons, so a longspear works. Though using a simple weapon makes the comparison with say a crusader cleric kind of embarrassing.

Anyway, pushing assault is a feat you may want some time given the focus on reach tactics.

Background-wise using a longspear suggests that you started in some sort of militia or levy, or if that's actually a boarding pike maybe as a sailor. Perhaps you picked up some spellbook or similar on the battlefield (whether from a dead ally or a fallen enemy) and slowly taught yourself a little magic and the prayers from that book. Or maybe it was in a lost cache that you discovered, or perhaps you were on the wrong end of a losing battle and nursed back to health by someone who followed the old gods.

[PhD. Okkam]

Spear Dancer (Combat feat) for build?