Teamwork is not situational in any game I've played.
You have not played a lot of D&D then. Which is apprant because you do not understand basic rules.
Teamwork is very situational and party dependant. Not a little bit situationa VERY SITUATIONAL, especially when it comes to teamwork leveraging other characters abilities.
No risk if you saw the destination.
This is untrue. You don't understand the rules or have not read the spell.
There is a 24% chance of spell failure if you can see the destination when you cast the spell.
This is on page 331-332 of the PHB .... or are we now for some reason fighting inside a teleportation circle?
It's winning every fight (except Tarrasque).
but only one per turn.
You attack, she moves.
you walk 30' and kill her.
She can't take another reaction.
You can't move in the middle of a spell. You can't cast Eldritch blast and then decide to move between the first ray and the second ray. This is covered on page 25 of the PHB.
Yes, you can keep attacking him from where you are standing when she teleports, but you lose your 12d8 bonus to those attacks because he is more than 15 feet away.
You precast a 9th level spell to get 12d8 damage on one attack - that is how the rules work.
Also she can only use this once per turn, but if you have 2 PCs like you said, that is on every single turn of combat because there are only 3 turns in a round.
it's not 12d8.
It's 12d8 per attack.
And she teleports away on the FIRST ATTACK, and if that was a spell (which all your huge damage examples are), you can't move and then attack again because you cast the spell where you are standing.
If you want to fix CME to be once per turn, then sure. That will solve this issue.
It is not once per turn, but if you are using a spell to get those multiple attacks every single enemy needs to be within 15 feet for every attack and you can not move between them
Dead creatures do not get legendary actions.
Dead creatures do not get legendary actions.
And he regeneration is at the start of his turn. So that won't give him any either. Though he might get one turn in, depending on initiative.
Dead creatures do not get legendary actions.
Dead creatures do not get legendary actions.
The Legendary actions happen before their turn.
Before we discuss this any more polease provide anything suggesting that they will not get legendary actions before their turn.
Your entire argument hinges on this fallacy. Three times I have provided the page numbers that say otherwise and you have provided a link, which if you read it said otherwise.