The effect for Adamant is invincible against physical attack for 5 seconds. The effect for Blessing is invincible against magic attacks for 5 seconds.
For instance, if you're getting gang-raped by a full party of warriors/sins/bps and the effect of an adamant goes off, no one can damage you for the next 5 seconds. I'd definitely go for Adamant over Blessing unless mages are a bigger problem than melee in your server.
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