Diamond Dust and Diamond Berg

Diamond Dust and Diamond Berg are two of the more powerful single-target Psynergies, available only in The Lost Age. They are exclusive to Piers when he is in his Mariner class series (only Mercury Djinn set).

Diamond Dust
An "attack with crystalline ice", Diamond Dust resembles a long group of large chunks of ice slamming into the enemy. Available to the Mariner, Privateer, and Commander classes, exactly what level Diamond Dust is learned at is never shown, as Piers has it when he joins the party at Lv. 18. Diamond Dust costs 6 PP to cast and strikes the target with Mercury power equal to the user's own attack power with 34 base Attack added.

Diamond Berg
Described as "freez[ing] and crush[ing] a foe", Diamond Berg is the attack that replaces Diamond Dust after Piers reaches the Captain class. It appears as a massive block of ice (the namesake iceberg) crashing down upon the target. Piers then physically strikes the frozen foe repeatedly, chipping off more ice with each blow. Diamond Berg is often regarded as Pier's "ultimate" attack by players, despite the fact it's high cost puts a strain on his low Psynergy supply (compare to Odyssey). Diamond Berg costs 17 PP to use and strikes the target with Mercury power equal to the user's own attack power with 92 base Attack added.