Ple-Sen
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There are abilities that protect against this. Again, by capturing a region, he still leaves himself open to attack. If he attacks Lorelei, in case of a counterattack, he will suffer guaranteed paralysis and injury, and may also lose a significant portion of his health. The character is strong, no argument there, but highly specialized.
Honestly, you have more reason to fear Swordgard. Carnea has many unpleasant abilities, but she cannot defend against all attacks on her territory 24/7. Moreover, Florensan, who maintains relative neutrality, is clearly not her priority target.