Part 1) Isn't such an idiot to think "kill allies" helps him personally to any degree, and thus realizes that if his goal is to kill as much as possible that having a few allies helping him ramps up both the potency and number of potential victims.What would his motivation be to actually follow a plan rather than try to kill us then everyone in the vicinity?
Part 1) Isn't such an idiot to think "kill allies" helps him personally to any degree, and thus realizes that if his goal is to kill as much as possible that having a few allies helping him ramps up both the potency and number of potential victims.
Part 2) You know how Orcs are always represented as being a serious and ongoing threat to civilized cultures? Yeah, they are Chaotic Evil, they live in tribes, they mobilize organized forces (a.k.a. armies) towards a shared goal (kill all the [blank] where the blank is filled in by anyone not on that orc's chosen "team", whether that is some other orc tribe or everything not orc and not willing to help orcs kill everything else). Yes, their lack of long-term vision that a neutral evil or lawful evil creature/character might have hinders their ultimate goal of their "team", and them specifically, being the biggest & baddest... and yet it doesn't stop them from always being a threat.
Basically, Chaotic Evil doesn't mean inability to team up and be cooperative. It just means that the reason for teaming up and being cooperative is one that is probably arbitrarily violent, greedy, hateful, or because of bloodlust.
True Evil believes it is doing the best thing, for the benefit of all.
Could you give me an example of Chaotic Evil character?
One with a Background,Goal, and Personality that would or could fit with a party?
What would his motivation be to actually follow a plan rather than try to kill us then everyone in the vicinity?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.