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They made a change with how swing speed and Leeches work:
Here's the blurb about the Soul Seeker, but applies as well to Calm:
Originally, the Soul Seeker had 40% Hit Stamina Leech, 40% Hit Mana Leech and 40% Hit Life Leech (the actual intensities, equivalent to 80% from a runic hammer), but when the changes came that altered how Hit Mana Leech and Hit Life Leech worked, its displayed values were dropped to 30%, from its high Swing Speed Increase. The net result was less amount given to the user over time, of those two attributes, but that every hit would give some hit points and mana back. While some consider it to be a Nerf, the change enhanced its usefulness in other ways, as it meant that when using Whirlwind Attack in large groups of creatures, it would be rare that the wielder would be killed by his attackers, and one would be certain to have mana to immediately use another whirlwind. In the prior form of the Leech properties, one had to hope that the 40% chances triggered often enough to keep one alive and supplied with mana.