Understanding the Archives of Nethys and the Magus Class
The Archives of Nethys is the Paizo official open SRD resource for Pathfinder. It contains all the rules, spells, items, and class options published under open gaming licenses. The Magus is one of the more mechanically dense classes in the game, combining martial combat with arcane spellcasting. If you are trying to build or understand a Magus using the archives, you need to navigate some overlapping systems that do not always interact cleanly on paper. I spent about three months last year running a Magus in a heavily optimized group and then rebuilding him from scratch when the party composition shifted. That was when I actually learned how the class functions outside of textbook character sheets. The Magus operates on two primary resource systems. Spell slots feed your arcane abilities. Combat stamina, tracked as arcane pool points, fuels your weapon enhancements and special abilities. These two resources overlap but are not the same thing. You can cast a spell without spending arcene pool. You can enhance a weapon without expending a spell slot. But most of the class's signature moves require both.
The arcana pool refreshes after a rest. Spell slots refresh the same way. Both are limited daily. The pool typically starts at your character level plus your Intelligence modifier. For a level 5 Magus with 16 Intelligence, that is 5 plus 3, equaling 8 points. Every weapon special ability has a point cost attached to it. Flame blade costs 2. Shocking grasp costs 2. Vital strike costs 2. You cannot max out every enhancement every encounter. You pick what matters.
Spell Selection Strategy
Most players fill their Magus spellbook with damage dealing spells. That is a reasonable default but it ignores the class's actual strength. The Magus excels at touch attacks combined with melee strikes. Spells like shield other, cat's grace, and magic circle against evil give you survivability without burning your action economy. You still get to hit things with a sword. The real trap is preparation spells. Magic vestment improves your armor class by a flat bonus. Stoneskin reduces damage taken. These scale poorly with level. A level 10 Magus wearing chainmail with magic vestment has decent AC but the action cost to cast these before combat eats into your turn. Cast them as a move action if you can, or better yet, have a cleric handle buffing while you focus on spellblade combos during combat.
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The spellstrike Interaction
This is where the class gets complicated and where most guides get it wrong. Spellstrike lets you deliver a touch spell through your weapon as part of a melee attack. You make your weapon attack normally. If it hits, the spell also activates. You can then make an additional attack at your highest bonus with the same weapon. That extra attack does not deliver the spell. It is just a regular swing. I ran into a problem during a boss fight against a creature with immunity to fire. My Magus had flame blade active and shocking grasp prepared. I spent my turn casting shocking grasp, delivering it through the sword, and then making the extra attack. The immunity made the spell useless. The sword attacks still did normal damage. I should have used shock shield instead or switched to a cold based spell. The lesson is simple. Always have a backup spell that targets a different damage type or effect category. The archives list every spell with its descriptors. Filter by energy type when building your spellbook.
Weapon Choice and Combat Flow
The Magus uses one handed weapons. You can wield a shield or a second weapon. Most people take a tower shield for defense or a light weapon for two weapon fighting. Two weapon fighting works but splits your attack bonuses and complicates spellstrike delivery. The standard build uses a longspear or falchion with a shield. Reach weapons let you attack from behind front line allies. Falchions crit on 18-20. That matters more than you think at higher levels. Your action economy each turn looks like this. Move action if needed. Standard action to cast a touch spell or make a weapon attack. If you use spellstrike, you deliver the spell through your weapon attack and get one extra attack. Swift actions are free. You can activate blade bond or quickened spells without touching your standard action. The key is never using your standard action for anything other than attacking or casting a touch spell once you are in combat range.
Common Build Pitfalls
Point one. Do not dump Intelligence. Your arcana pool size depends on it. Your spell DCs depend on it. Your skill points depend on it. An 14 minimum is the absolute floor. 16 is standard. 18 is optimal if your build allows it. Point two. Do not take the Scribe feat unless you have a dedicated crafting strategy. Spellbooks cost gold. Each spell entry costs 50 gold pieces per caster level. A level 5 Magus spellbook with 15 spells costs 3750 gold. That is a significant portion of early game resources. Point three. Arcane bond is optional but nearly essential. Familiar bonds give you scout utility and shared senses. Body bonds give you a weapon that never leaves your side and grants bonus abilities at higher levels. Spell storage bonds let you pre-cast spells and release them later. I recommend body bond for melee focused builds and spell storage for casters who want to conserve slots.
Advanced Tactics That Actually Work
Concentration checks matter more than people realize. When you take damage while casting, you must succeed at a Concentration check or lose the spell. The DC is 10 plus the spell level plus damage taken. A level 3 spell requires a 16 or higher on a d20. That is difficult when an enemy hits you for 12 damage mid cast. Stand behind your tank. Use cover. Cast defensively when possible. Magus elitist is an archetype worth considering if you want to optimize spell efficiency. It trades versatility for stronger spell effects at the cost of fewer total spells known. It works well in organized play where optimization matters more than roleplaying flexibility. The standard Magus path is fine for casual games. Elitist is for people who want every point to count. Team coordination changes everything. Tell your party what buffs you are carrying. A wizard casting Haste on your Magus before combat is worth more than any feat you could buy. The archives include a full compendium of all available spells and their interactions. Cross reference spell descriptions with your class features before finalizing your build. Things like spell turning and spell resistance interact with your own magic in ways that are not obvious until you test them.
The Magus class requires you to manage two separate resource pools while maintaining melee presence. It is not simple. It is not weak. It is mechanically heavy and rewards players who study the system rather than treating it like a standard fighter with spells tacked on. The archives give you everything you need. You just have to read past the basic descriptions.
