The Essive-modal case reference article from the English Wikipedia on 24-Apr-2004
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Essive-modal case

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Cases
Abessive case
Ablative case
Absolutive case
Accusative case
Adessive case
Allative case
Comitative case
Dative case
Dedative case
Elative case
Ergative case
Essive case
Genitive case
Illative case
Inessive case
Instrumental case
Locative case
Nominative case
Oblique case
Partitive case
Possessive case
Postpositional case
Prepositional case
Prolative case
Terminative case
Translative case
Vocative case
Declension
List of cases

This case in Hungarian language can express the state, capacity, task in which somebody is or which somebody has (Essive case, eg. "as a reward", "for example"), or the manner in which the action is carried out, or the language which somebody knows (Modal case, eg. "unexpectedly", "speak German").