If you have i100 weapon it means you have the animus part at most or atma part
Which mean it's garbage and would take too long to finish it

If you got the Zodiac weapon (i125) then by all mean finish it... You only get the zêta light and it's done

...

People tend to mistook the first relic part from i80 to nexus
And the end part which is zodiac and zêta
Unless you're at zodiac 4 quest or zêta don't bother finishing it