G1 (US) has released Ralph and Black Dragon Pet from now until April 25. Both requires items from cash shop. See Ralph and Black Dragon Pet for details, and here for answers on trade status of various items.
Ralph's Prison Key (500 Gold) can be used by clicking on the green arrow at City of Auch (D8). The possible rewards include Ralph Character Card, [Shining Sting] Stance Book, Improved [Shining Sting] Ring, L'energie de L'opale (AR33 Jewel Crossbow), and more.
Black Dragon Box (400 Gold) may drop Black Dragon Pet Box, EXP Cards, Stance EXP Cards, Triumph Potions, Drop Rate Manuals, Earth Stones, Strength Potions, Pet Food, L100 Enchantment Chips, Citadel of the Gods Pass (1 day), and Honor Cards.