Kal'gerion battle commendations are rare drops from Kal'gerion demons. Reading the commendation will award the player with a demonic title. These titles are unlocked in the order listed below (same order as the level of the bosses in Dungeoneering). Unlocking also depends on previously killing the respective Dungeoneering form of the boss.
The commendation may be banked and saved until the required boss has been defeated, but only one scroll can be owned at a time. Reading the commendation prompts the message, "As you read the scroll, you feel a great power wash over you. You have been awarded a Kal'gerion war rank." You may receive the commendation as a drop even if you are below the level required to unlock the title. The drop can be received whilst using a Scrimshaw of Sacrifice. You can also receive the drop as a reward from the chest in Rush of Blood, provided the demon was fought in a wave.
Unlocking all 5 Kal'gerion titles completes the Kal'gerion Commander achievement and is a requirement for the trimmed completionist cape.
For an exhaustive list of all known sources for this item, see here
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