Translates to "Untamable", as in the metal Adamantium.
The enhanced Reprisal effect increases the block rate of the shield close to a 100%, however since Reprisal will wear off once an amount of damage equal to Half your total HP has been reflected, there's a good chance that it will cause Reprisal to wear off long before the 1 minute duration is up.
The only thing i'm still wondering about myself is, how high is the resist rate for the status ailments? Anyone know?