Bone Sword should throw crossbones similar to the 1.4.1 Bone Glove.
Adamantite Glaive and
Titanium Trident should fire a projectile similar to the North Pole, but without the snowflakes. Adamantite Glaive's projectile would pierce two enemies before breaking, while the Titanium Trident's wouldn't pierce at all.
Gladius should receive a buff if the player is wearing the Gladiator set.
Cobalt Sword should make the player faster and jump higher when holding the sword. After striking an enemy, the user would get the Ninja Stealth buff for three seconds. This makes the player swing faster, go even faster, and jump even higher. Also, it should be renamed to Cobalt Katana.
Cobalt Naginata, on critical hit, should give the player Ninja Stealth for ten seconds.
Palladium Pike, on critical hit, should make the enemy burst into flames, sending fire spikes to nearby enemies.