Wisgarus Dragonslayer is one of the two skins released under the monthly Fantasy Portal offer. It could be individually purchased with game coins in mid October 2018.
Wisgarus Dragonslayer could be purchased in the Skins Shop under the 'Fantasy Portal' tab for 2900 coins. This skin was available for a limited time and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: The Fantasy Portal offer with the Wisgarus Dragonslayer skin was released again for a limited time in early December 2020. The cost for Wisgarus Dragonslayer increased to 3300 coins for this release.