Blessing of Might

Blessing of Might increases the attack power and mana regeneration of the blessed player(s). It is learned at level 56 for.

Greater Blessing of Might
Prior to Patch 4.0.1, paladins also had trainable Greater Blessings, including Greater Blessing of Might. Each Greater Blessing affected all players of the targeted class within your party or raid and lasted for 30 minutes (as of patch 2.2), as opposed to normal blessings, which were single target.

Each Greater Blessing cast required the reagent which could be bought at any reagent vendor.