>>If the protag has the trident, the conflict is all about him retaining it. That will end up reactive, static, predictable. Give him a goal that sends him on a journey.
Agree. The Trident is a MacGuffin, the organizing principle of the plot, the object everyone wants.
>>"all who whom seek the Trident for their own purposes."
Okay, they seek it for different ends -- but they should be using the same means, that is, by exploiting whatever special power the Trident has.
>>"Though the Trident has many abilities"
I think it might be better to focus on one feature. The ark of the covenant in "Raiders of the Lost Ark" is not a multipurpose, supernatural Swiss army knife. It does one thing well; it has one unique feature that the Nazis covet: it makes the army that possesses the ark invincible.