All of these are also compatible with what was seen in "Obsession" or ST2: the "energy pod" could be the sphere used against the vampire cloud in the episode, and the sleek shape from the movie could hold one or more of these spherical energy pods as its warheads.
Yes, but in
Obsession photon torpedoes are used against the creature, but are ineffective. Yet, the very same mechanism that is supposed to be in the torpedoes (the antimatter pod) later destroys the creature. And characters do not express any doubt about it's effectiveness.
Well, stop to think about WHY the ship's weapons were not effective.
Phasers passed through "holes" in the entity. Pretty much the same as torpedos did. They were able to "hit" it, but it was able to "move out the way" (both physically and... well, "space/time/technobabblishly").
What we see is that it was able to do this... MOMENTARILY. Not "permanently. And not over a long distance.
Get it? The creature wasn't "invulnerable," it was just able to avoid getting hit. It was just really really good at evasive maneuvers.
Had the torpedoes actually "impacted" on the creature and had any degree of dwell time, rather than being instantaneous "flashes" which the creature was able to, essentially, dodge... we might have seen a more effective result.
So... the creature is on a planetary surface, and you pop off what is effectively an "super-duper-uber-nuke." Unlike in space, the energy is not instantaneously dissipated. It sticks around, not just for a fraction of a second, or even for a couple of minutes, but for days, weeks, MONTHS...
The creature may have been able to "step aside" from the blast, instantaneously, but it wouldn't be able to STAY "stepped aside."
So it would "dodge" and maybe survive for an extra fraction of a second, then it would reappear, in the middle of a massive fireball which makes any nuclear explosion we've ever conceived of seem like a firecracker by comparison.
It's like taking shelter from a nuke behind a steel door. It might protect you for a few milliseconds longer than if you were unprotected, but you're still toast.
