Learn Finnish: Kääpiö totelkoon kuningasta, jonka miekka on painava. - Let the dwarf obey the king, whose sword is heavy.

This sentence uses the 3rd person imperative (often called the jussive), marked by the -koon suffix. Regular imperatives order the person you are talking to directly, whereas the jussive expresses a command, wish, or concession directed at a third party ("let him obey" or "may he obey").

How do we form the jussive verb totelkoon from the infinitive totella?

Totella (to obey) is a type 3 verb. To form the 3rd person imperative, you use the consonant stem. You find this by dropping the final -la / -lä from the infinitive to get totel-, and then attaching the jussive suffix -koon.

Why is the subject kääpiö explicitly stated here?

Standard 2nd person commands often drop the subject because "you" is implied (e.g., "Obey!"). However, with the 3rd person imperative, you must state the subject so the listener knows who is supposed to perform the action. The subject of a jussive verb takes the standard nominative case (kääpiö).

Why is the object kuningasta in the partitive case? Do imperatives change object rules?