Going Underwater

[Taqwus]

Anything undead will ignore the triton's poison, and most undead will never rout. Plus, low-level types can be had cheaply, which lets you wrap your commanders in them to minimize that risk. Mechanical Men have similar properties, and have better prot and resistances.

Triton commanders also are vulnerable to Earth Attack and Mind Hunt, and if memory serves don't have bodyguards if you have a fairly tough amphib assassin like a Ashikagan Jonin.