Slipfinn - Lv.120
Give your entire party Odin Helmet, Heavy Echo Gloves, and Slipfinn's amazing E4
Park your Slipfinn somewhere safe while your teammates run around the map setting up opportunities for you to score incredible instant kills. The STARFISH places Stargazer's Sphere rings over the most dire threats on the map, and as your strong and sweaty friends attack it, the Stargazer stars use their huge damage values as a base, on which to stack Odin Helmet, Heavy Echo Gloves, and Slipfinn's incredible E4 which can bypass all Steadfast properties.
Odin Helmet can activate sequentially with Heavy Echo Gloves, resulting in instances of damage with 400x or even 8,000x post-mitigation damage amplification, on top of the fact that it ignores Steadfast. The longer an enemy remains in the watchful eye of the Stargazer trinket, the more certain it becomes that they will eat one of those miraculous insta-kill stars, immediately deleting them. Of course, even without praying to the RNG, Heavy Echo Gloves alone is significant, and each Stargazer star has 3 independent chances to activate Slipfinn's E4, which shreds durable Steadfast monsters, on top of this build's 14% chance to activate Odin Helmet, which multiplies the final damage dealt to a target, effectively multiplying all other post-mitigation amp bonuses.
Notably, the STARFISH is capable of allowing virtually any Sea Fortress-capable parties to quickly deal with any of the rarespawn super-bosses: The troupe of Paladins, Shadow of Bahamut, and the keeper of the Archon Armor are all vulnerable to sudden death by STARFISH.
Because Stargazer's Sphere can even affect units who have Spell Immunity (BKB), the only enemies who would be entirely immune to the STARFISH are ones with complete immunity to Pure damage. Since no Pure-immune monsters are significant threats, and none are required to be defeated in order to clear a map, this is never a problem - the regular monsters with Pure immunity appear only in one area of Winterblight's castle, and the only boss with Pure immunity will eventually turn blue, becoming vulnerable to Pure damage (at which time even a single relatively weak STARFISH star is capable of disintegrating him).