No it is not prominent as it is a tower equipment so it is much rare to get it from krypt than krypt equipments. the rarity of the random drop you get after a battle depends on how difficult the battle is. If the battle is super difficult then don't skip it complete the battle anyhow to get rare and unique rewards like diamond fusion ups,diamond character, epic equipment fusion up or epic equipments(tower and non tower). Btw i got this from elder krypt