Lapistia

Does the "Denial" effect last until the end of the battle? Can the buff be active on any number of targets simultaneously? Does the target use the caster's willpower or its own? Does the reflected damage take into account the armor of the defending unit, the attacking unit, or does it ignore it altogether? Does the mana shield still not require activation and work passively? Can "Purification" remove the same negative effects as "Entropy," or are there effects that only "Entropy" can help against?