Xenoclitic

The plural oblique of xenoclitic classes was not distinct from that of oikoclitic classes in ER.

Source: wiktionary

Although there are some similarities between oikoclitic and xenoclitic classes - perhaps most noticeably the constant plural oblique -en (though with a variant -jen restricted to the oikoclitic classes), an inflection that is clearly indigenous - there are also striking differences.

Source: wiktionary

Oikoclitic participles are based on the perfective stem of verbs, while xenoclitic participles are marked by a special participial suffix.

Source: wiktionary