Question! How to add sonic descriptor to a spell?


Rules Questions

Scarab Sages

Sooo I'm new to pathfinder, in fact practically new to 3.5. I was building a strength magus and I think I'm getting the hang of it.

But I was wondering if, when I cast a spell through the magus ability spellstrike (spell casting through melee attack) and used a magic sword with the magical ability 'thundering', does the spell I used also gain the sonic descriptor?

If not, is there a way to add a sonic descriptor to a (magus) spell? I would like to trigger the metamagic feat 'concussive spell'.

Thanks!

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Thundering
Price +1 bonus; Aura faint necromancy; CL 5th; Weight —
A thundering weapon creates a cacophonous roar like thunder whenever it strikes a target with a successful critical hit. The sonic energy does not harm the wielder. A thundering weapon deals an extra 1d8 points of sonic damage on a successful critical hit. If the weapon's critical multiplier is ×3, add an extra 2d8 points of sonic damage instead, and if the multiplier is ×4, add an extra 3d8 points of sonic damage. Subjects dealt critical hits by a thundering weapon must make a successful DC 14 Fortitude save or be deafened permanently.
Construction Requirements
Cost +1 bonus
Craft Magic Arms and Armor, blindness/deafness
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Concussive Spell (Metamagic)
You cause creatures to be disoriented when you affect them with a spell that has the sonic descriptor.
Benefit: With sonic damage comes a concussive wave of energy that rattles creatures affected by the spell. A concussive spell causes creatures that take damage from a spell that has the sonic descriptor to take a –2 penalty on attack rolls, saving throws, skill checks, and ability checks for a number of rounds equal to the actual spell level of the spell. A concussive spell only affects spells with the sonic descriptor.
Level Increase: +2 (a concussive spell uses up a spell slot two levels higher than the spell’s actual level.)
Pathfinder Roleplaying Game Ultimate Magic.
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As far as I know, it must already have the sonic descriptor. Nothing I know of can change that.
Thundering only applies to the extra damage mentioned in the description. It doesn't do anything more, even for a magus' spell strike.

Scarab Sages

Sonic and Force are the least resisted energy types. There is no metamagic or sorcerer bloodline to change damage type for these as there is for the other energy types.

The spell must already have the sonic descriptor.

If this is for a home game, you can work with your GM o research a sonic version of another spell, but it will likely be higher level than the equivalent non-sonic spell, less effective, or both.

Scarab Sages

Ok thanks!

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