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English word merciness comes from English mercy, English -ness
mercy (English)
(obsolete) To thank. (countable) A blessing, something to be thankful for.. (countable) Instances of forbearance or forgiveness.. (uncountable) A tendency toward forgiveness, pity, or compassion. (uncountable) forgiveness or compassion, especially toward those less fortunate.. (uncountable) relenting; forbearance to cause or allow harm to another Expressing surprise or alarm.
-ness (English)
Appended to adjectives to form nouns meaning "the state of being(the adjective)", "the quality of being(the adjective)", or "the measure of being(the adjective)".. Appended to words of other parts of speech to form nouns (often nonce words or terms in philosophy) meaning the state/quality/measure of the idea represented by these words.
merciness (English)
The state, quality, or condition of being merciful; mercifulness.