The word saktha has acute accent (udātta) on the final optionally when preceded by any word other than what ends in kra,
The word सक्थ is the samasanta form of सक्थि 5.4.113. Thus गौरसक्थः꣡ or गौर꣡सक्थः, श्लक्ष्णसक्थः꣡ or श्लक्ष्ण꣡सक्थः The word गौर being formed by प्रज्ञादि अण् and श्लक्ष्ण by कस्न (Unadi III. 19) are both end-acute. Why 'not after a word ending in क्र'? Observe चक्रसक्थः꣡ which is always oxytone as it is formed by षच् 5.4.113 a चित् affix.,