I have never heard a word "advertently" even though "inadvertently" is a common word. Both were used in Latin but somehow the first word became lost over time. The Latin verb "advertere" means to "turn toward", or in other words, "to direct your attention towards something". So if something happens inadvertently it means it happens without the aid of direct attention. "Advertently" is not a word, so far as I know, but if it were a word it would mean "with direct attention or intent". That word is not needed because we have many other words that mean the same thing: "thoughtfully", "attentively", "conscientiously", "carefully" ... With so many synonyms, there is no need for "advertently". "Riven" is a past participle, so your last sentence is not grammatical. You would have to say "has riven" or "had riven". "Condition" is a noun. The adjectives "conditional" and "unconditional" are opposites, the first meaning "with conditions" and the second meaning "without conditions".