lopullisista
Lopullisista is the elative plural form of the Finnish adjective lopullinen, meaning final or definitive. In Finnish, adjectives decline to reflect number, case, and their relationship to a noun. The ending -is-ta corresponds to the elative plural, used when describing a plural noun in the elative case, indicating movement from or origin relating to those items.
A typical usage is to place lopullisista directly before a plural noun in the elative, for example
Lopullisista belongs to a broader set of inflected forms for lopullinen, including lopulliset (nominative plural), lopullisten
Etymology-wise, lopullinen derives from loppu, meaning end, with the suffix -llinen forming an adjective meaning “pertaining