There is a Legacy version
here.

MagusSource Impossible Magic pg. 88You’ve learned to mix physical combat with spellcasting.
Multiclass Magus Characters
The magus archetype grants you the ability to cast a limited amount spells, though you can learn more. It’s a good choice for martial characters who want to add a little magic to their repertoire. After some study, a magus multiclass character can learn the ability to combine their magic and their weapon strikes into a single devastating blow.
Archetype Dedication Multiclass Source Impossible Magic pg. 88Archetype MagusClass MagusPrerequisites Strength +2 or Dexterity +2; Intelligence +2
You cast spells like a
magus, gaining a spellbook with four common
arcane cantrips of your choice. You gain the
Cast a Spell activity. You can prepare two cantrips each day from your spellbook. You’re trained in the spell attack modifier and spell DC statistics. Your key spellcasting attribute for magus archetype spells is Intelligence, and they are arcane magus spells. You become trained in
Arcana; if you were already trained in Arcana, you instead become trained in a skill of your choice.
Archetype Source Impossible Magic pg. 88Archetype MagusClass MagusPrerequisites Magus Dedication
You gain the
basic spellcasting benefits. Each time you gain a spell slot of a new rank from the magus archetype, add two common spells of that rank or lower to your spellbook.
Archetype Source Impossible Magic pg. 88Archetype MagusClass MagusPrerequisites Magus Dedication
You gain a 1st- or 2nd-level
magus feat of your choice.
Archetype Source Impossible Magic pg. 88Archetype MagusClass MagusPrerequisites Magus Dedication
You gain the conflux spell from a
hybrid study of your choice. If you don’t already have one, you gain a focus pool of 1
Focus Point. You can
Refocus by studying your
spellbook and performing a physical regimen. You don’t gain any of the hybrid study’s other benefits.
Archetype Source Impossible Magic pg. 88Archetype MagusClass MagusPrerequisites Magus Dedication
You gain the magus’s
Spellstrike activity. You can recharge it only as an activity that takes 1 minute. This restriction applies even if you gain another ability that normally recharges Spellstrike.
Archetype Source Impossible Magic pg. 88Archetype MagusClass MagusPrerequisites Basic Martial Magic
You gain one
magus feat. For the purpose of meeting its prerequisites, your magus level is equal to half your character level.
Special You can select this feat more than once. Each time you select it, you gain another magus feat.
Archetype Source Impossible Magic pg. 88Archetype MagusClass MagusPrerequisites Basic Magus Spellcasting; master in
Arcana
You gain the
expert spellcasting benefits.
Archetype Source Impossible Magic pg. 88Archetype MagusClass MagusPrerequisites Expert Magus Spellcasting; legendary in
Arcana
You gain the
master spellcasting benefits.