Pathfinder: Good spells for drowning?

[ppf66208]

My character died recently and rather than having to deal with bringing him back my DM had a divine intervention. My character saw a vision of Besmara, and she gave me a deal. I get my life back but once a month I have to murder someone by drowning.

They need to be someone valuable, a pirate captain, a cleric of another god a Chelish officer, someone like that. It has to be drowning, and failure results in a curse that do creases it's harm over time. I need to figure out some spells for my oracle to pick up next level that could assist with drowning. Any suggestions?

[Psyren]

Create Water, Divine Power, hold their head under, repeat.

[Alent]

See if your DM will let you summon a Nereid with an appropriate grade of Summon Monster?

[FidgetySquirrel]

Make a small, circular wall of stone, via the spell, of course, and spam create water. Obviously if they can fly or teleport, or have good reflex saves, or have a climb speed, or access to spider climb, this isn't an ideal way to do it, but it's an idea.

[Rainshine]

What level? Planar Ally a Drowning Devil?

[avr]

Admonishing Ray does nonlethal damage. Take them out that way and you can finish them any way you like.