Patch 5.2.0 (5-Mar-2013): Might of the Frozen Wastes now increases melee damage by 15% (was 10%).
Patch 5.0.4 (28 August 2012): Updated; changed from When wielding a two-handed weapon, your melee attacks deal an additional X% damage and your autoattacks have a Y% chance to generate 10 Runic Power.
Patch 4.2.0 (28-Jun-2011): Now increases two-handed weapon damage by 3/7/10%, down from 4/8/12%.
Patch 4.0.6 (8-Feb-2011): Now also increases all melee damage by 4/8/12% while wielding a two-handed weapon.