CoverUp: Drakkard

From BoardGameGeek:

Between vicious conquest raids and lengthy trade journeys, the best way Vikings knew how to unwind was by thrashing friends and rivals in a few tense games of Drakkard. From mead halls to the Drakkar ship's prow, Drakkard steeled Viking hearts and minds. Jarls and sprogs, warlords and farmhands alike-bound by the North Sea's wild call, they roared to battle when war-drums rolled like thunder o'er the frost-rimed shores. Your objective is to command a mighty Viking fleet in Drakkard, a tactical clash of wits and warfare on the high seas. Build the largest fleet over the course of the game or strand your opponent for a decisive victory. Overlap Reinforcement cards to grow your naval power while sinking your opponent. Raid enemy vessels and call on Sea Monsters to trap the enemy Flagship and protect your own. Fast to learn and fierce to master, a strategic duel of skill and cunning awaits you, Steed of the Sea... Mix and match any two CoverUp sets to unleash entirely new ways to wage war. Face off in crossover battles, where rival clans from different worlds collide in volatile duels on a battlefield stitched together from both Reinforcement decks! Or rally up to 4 players for team battles, where you and an ally coordinate powerful combos across sprawling twin maps to break your challenger and claim total dominance! -description form the publisher