From The Heroes of Might and Magic III wiki

This is a combination artifact.

Combination artifacts were introduced in the expansion Shadow of Death,
and are only available when it is installed.

Worn on the Torso the Power of the Dragon Father gives you +6 to all Primary Skills, and the hero's troops become immune to level 1-4 spells in addition to the bonuses from the individual parts.

Requires the following artifacts to create:

• Crown of Dragontooth
• Necklace of Dragonteeth
• Dragon Wing Tabard
• Red Dragon Flame Tongue
• Dragon Scale Shield
• Quiet Eye of the Dragon
• Still Eye of the Dragon
• Dragonbone Greaves
• Dragon Scale Armor

You cannot purchase combination artifacts in Artifact Merchants. Cost is derived from sell price.

Basic Cost: 210.000 gold