Both Kraken's Lament and Leviathan's Call do the same thing: Blocks 50% incoming melee attacks for 10 rounds. And both can only be used on the Buccaneer.
1.) Triton's Song (Blocks 25% Melee Damage for 10 Turns) 2.) Kraken's Lament (Blocks 50% Melee Damage for 10 Turns) 3.) Leviathan's Call (Blocks 50% Melee Damage for 10 Turns)
**Question edited for clarity by One-Eyed Jack on 1/14/2013**