Underwater weapon rune and magus spellstrike with fire spells.

[Benjamin O'Connor-Rose]

I've been playing a fire focused dragonblood magus in a home campaign, the DM just dropped that we would be doing a long stretch in an underwater area, the DM suggested we take a while to find a way to function underwater I've only found 2 potential ways for my fire magic to function underwater, the steam spell metamagic, which is locked behind being an undine, and since undine is a heritage not an ancestry adopted ancestry wouldn't let me get access to it
The other path I see is putting the underwater rune on my weapon, which allows the weapon to function normally underwater, but more importantly it specifies that fire damage dealt by an attack made with this weapon is treated as though the target was not underwater. I know the damage from a attack spell combined into spellstrike does count for that regard, but my main worry is that being underwater prevents you from casting spells or taking actions with the fire trait. But since spellstrike is a separate action from cast a spell,would this plan eork?

[The Raven Black]

RAW, no. For the reason you specified, since Spellstrike includes casting a spell.

Now, maybe your GM is merely testing the players' creativity. So the rune might fly.

Taking a Fire Kineticist MC Dedication might work too. Maybe.

Or ask to retrain into a Fire Kineticist completely.

Or it is time to use your non-Fire spells.

[Finoan]

The Raven Black wrote:

RAW, no. For the reason you specified, since Spellstrike includes casting a spell.

Agreed. The Spellstrike works fine. The Cast a Spell action inside it is still limited to non-fire spells when underwater, as well as the need for air to be able to speak.