Although the vast majority of deep marshals are dwarves, a few non-dwarves have earned enough trust to be trained as deep marshals, or have learned the same techniques from studying old dwarven spellbooks.
A deep marshal is proficient with light armor, medium armor, and shields (except tower shields). A deep marshal can cast magus spells while wearing light armor or medium armor without incurring the normal spell failure chance. In addition, a deep marshal gains the heavy armor magus ability at 9th level.
A deep marshal learns numerous arcane secrets involving the shaping and warding of earth and stone. She adds the following sorcerer/wizard spells to her magus spell list as magus spells of the same level: crafter’s curse, crafter’s fortune, erase, expeditious excavation, fabricate, greater make whole, knock, major creation, make whole, mending, minor creation, move earth, passwall, stone shape, transmute mud to rock, transmute rock to mud, and all 0- through 6th-level sorcerer/wizard spells of the abjuration school. She must still add such spells to her spellbook to prepare them. If a spell appears on both the magus and sorcerer/wizard spell lists, the magus uses the lower of the two spell levels listed for the spell. A deep marshal cannot cast spells from the enchantment, illusion, or necromancy school and she cannot activate spell-completion or spell-trigger magic items that use spells from those schools (without making a successful Use Magic Device check).
This alters the magus’s spellcasting.
A deep marshal is limited in how she can use her arcane powers. Her arcane pool has a number of points equal to 1/3 her magus level (minimum 1) + her Intelligence modifier. Furthermore, she cannot use her arcane pool to grant an enhancement bonus or weapon special ability to a weapon she is holding unless it is a battleaxe, heavy pick, warhammer, or weapon with the word “dwarven” in its name. She can use her spell combat or spellstrike abilities only with such weapons.
This alters arcane pool, spell combat, and spellstrike.
At 3rd level, a deep marshal can use the magical properties of her weapon in order to augment her spellcasting. Whenever she casts a magus spell while wielding a magic battleaxe, heavy pick, warhammer, or weapon with the word “dwarven” in its name, she adds half the weapon’s enhancement bonus to the her caster level (minimum +1). When attempting a caster level check to overcome spell resistance, she instead adds her weapon’s full enhancement bonus.
In addition, she is treated as having a number of ranks in Knowledge (dungeoneering) and Profession (miner) equal to her magus level, and she attempts Profession (miner) checks using her Intelligence modifier instead of her Wisdom modifier.
This ability replaces the magus arcana gained at 3rd level.
Pathfinder Player Companion: Arcane Anthology © 2016, Paizo Inc.; Authors: Alexander Augunas, Steven T. Helt, and David N. Ross.