The Vindicator is an Epic Battleship (the site catalogs it at Grade 4, 18 tiers, level range 40-70) designed as a multi-ship battle champion for Armada, Solo Armada, and Invasion Boss combat. It's built to take damage and hit back harder the longer a fight runs, rather than to end a fight quickly.
Taunt, its active ability, forces opponent Armadas to focus the Vindicator for a set number of rounds -- 20 initially -- and upgrading the ship extends that duration while cutting the cooldown. Unfettered Revenge, its passive, boosts weapon damage by 300% (up to 5000% at max rank) for 5 rounds every time the Vindicator is hit by an Armada, and the effect stacks cumulatively the more damage it takes -- though weapons that fire multiple shots per attack only trigger it once. Together, that makes it purpose-built for Grade 6 Armadas: it survives the incoming punishment and gets stronger the longer the fight drags on.
A dedicated Starship Tree Research branch improves Armada performance, extends warp range, lengthens Taunt's duration, and strengthens defenses -- including Taunt effects broken out by Federation, Klingon, Romulan, and Solo Armadas, Isolytic Defense against Grade 6 Solo Armadas, base hazard resistance, and global Chase nodes that benefit every ship you own, not just the Vindicator.