Unfortuately the Dragon Scale Helmet can't be obtained from any of Bosses of the First Dragon Event. The helmet is looted from the boss Soul of Dragonking Zyrtarch.
As Lehula said Dragon Scale Helmet don't drop from first dragon event bosses. The item you can get during the evnet is is Dragon Scale Boots which drops from the boss Kalyassa according to TibiaWiki.
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