elber

/elber/

Cases

SingularPluralWhen to use it
nominativeelberthe riddleelberlethe riddlesthe plain dictionary form — the doer of the sentence
genitiveelbernithe riddle'selberlenithe riddles'the owner — whose it is
accusativeelbernithe riddle (as the object)elberlenithe riddles (as the object)a specific, known object — whom or what
dativeelbergeto the riddleelberlegeto the riddlesdirection or recipient — to where, to whom
locativeelberdeat / in the riddleelberledeat / in the riddleswhere it is; also having — mende bar, "I have it"
ablativeelberdenfrom the riddleelberledenfrom the riddleswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
myelberimmy riddleelberlerimmy riddles
yourelberingyour riddleelberleringyour riddles
his / herelberihis / her riddleelberlerihis / her riddles
ourelberibizour riddleelberleribizour riddles
you all'selberigizyou all's riddleelberlerigizyou all's riddles
theirelberleritheir riddleelberleritheir riddles

The overlap in the last rows is real, not a mistake: elberleri can mean "his / her riddles", "their riddle", or "their riddles" — context decides.