Quenya 

-lta

their

-lta (and -ltya), 3rd person pl. pronominal possessive suffix "their", alternating with -nta/-ntya in Tolkiens writings (VT49:16, 17), just as the ending -ltë "they" also has the variant -ntë. According to VT49:17, the ending -lta or -ltya will appear as -ilta, -iltya following a consonant; other sources rather point to -e- as the connecting vowel in such cases (VT49:17).