None of the toggles are mutually exclusive.
I can't remember what teleport does but I think it is a white flash.
However when you move you will leave a black cloud behind you which will fade out I think.
@Unthing ... Mostly on Union.
Teleport is a white flash alright 
.
Thanks for the answers! 
One more question. When I put a "Reduce Endurance Cost" Enhancement in any toogle on/off DM Power, does it reduce my endurance cost just when I turn the power on or does it also reduce the endurance cost while the power is active?
I could be wrong but I believe that toggle powers are free to cast and only use end over time. Thus end reductions reduce end the whole time the power is active.
Defiant
Proud Member of the Liberty Legion
Venture - Emp/En Defender
Seph - Kat/SR Scrapper
Blizzard - Ice/Storm Controller
Legionelosis - Rad/Rad Defender
Sounds about right(, although Dark Melee doesn't have any toggles 
).
i can run Dark Embrace, Obsidian shield, Murky cloud (all slotted 3 dmg res SO's 1 end red SO), along with Combat jumping (1 def buff SO) and Acrobatics (1 end red SO). (CoT missions suck)
With stamina, i can smash my way thru an entire mission of +1/2 minions only needing to rest after large group fights or a boss (time between mobs + Dark Consumption cooldown that pops up at just the right time keeps the endurance high 
) have to limit myself mainly to Shadow punch and Brawl but the fury bar is always full(ish)
However, if a toggel drops at the wrong time, or an extra couple of mobs get attracted to the smash then im in a world of pain 
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have to limit myself mainly to Shadow punch and Brawl but the fury bar is always full(ish)
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Brawls damage vs endu cost ratio is really bad, but i guess if its just to keep the fury bar high when your out of endu why not.. but still, any of your other brute attacks are much better. Can brawl in pvp thou, it has a chance to turn of toggles.
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About the dark cloud of materia. Only the cloak of darkness turn you into the cloud, the other powers just add some cloudy materia around your model which isnt even half as cool as CoD alone. Murky add some white glitter, obsidian gives you some purple rings around your head(looks wierd imo). Oppressive gloom gives you a red glow around the torso area. kinda like the green regeneration thing(dont remember its name). Also Cloak of Fear adds white skulls floating around you.
/D
Can I use several DM Powers (the toggle on/off shield powers) at the the same time?
And what does it look like when I teleport. Is this a white flash or a dark cloud?