Rad/Sonic is very very very end heavy
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
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Rad/Sonic is very very very end heavy
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very
Im not so sure Sonic is end heavy (my blaster has it pretty easy)
Rad, on the other hand...
Huff puff puff
I think endurance usage comes down to the dynamics of the team. You can go thru a mission doing very little damage per endurance to alot of damage per endurance. In large teams a round up and arrest will allow for AoEs thatll hit upto 10 or hit upto 16 which means each enemy hit for low damage adds up to great damage to group for little endurance. Round up and arrests are actually good for debuffers and teams as their debuffs effect as many as possible and the teams are more uber for it. I would say end slots would have to be in almost every power with upto 2 in the most commonly used.
Id also say with IO slotting and invention slotting it does get easier and with powermastery for conserve power easier still. Respecing out of stamina when you can get conserve might be easiest as you may find your builds level of efficiency will change with every team.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
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Could I avoid Fitness pool with A.M. always on? Maybe with A.M. and some APP power?
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Not unless you like running out of endurance all the time.
Unless buffed, he will anyway in long fights 
My Rad doesn't run out of endurance in long fights anymore. Stamina, two set bonus giving 2.5%, Miracle giving 15%, Numina giving another 10%, power sink and then AM quite a bit of the time..... OK it cost me a fortune, and stamina is still required
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
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and stamina is still required
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I gave my rad rad a bit of a rethink last night with the new Inventions and i got my end consumption way down, so it could be how ya slot the rest of the build that matters. Mids planner doesnt allow for an attack chain planner with toggles running and so I kinda had to work it out on excel. I have yet to do my TA which tends to lose end too much when I have accidentally left flight on or in teams where enemies are fought in spread groups but her EPS will definately drop making her staminalessness even easier.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
If I stand back and dont spam Iradiate using choking cloud all the time then my end consumption is fine without inventions, inventions have made iradiate much more friendly for spamming. Of course I now have a set in there which really reduces its end cost, but thats a new thing
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
[ QUOTE ]
Clicking Hasten and Accelerate Metabolism at same time makes them almost perma (maybe really perma with some IO sets).
Could I avoid Fitness pool with A.M. always on? Maybe with A.M. and some APP power?
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WEll it depends how you play it imo. My little rad sonic which is slowly going up the lvls has no stamina, however I play it almost purely support with only the single cone attack (that I use) taken at early lvls but probably being respect out later.
By slotting very heavily on the end reds you can manage on AM. But I could imagine that if you plan on throwing in alot of blasts and getting the most from your sonic attacks that stamina would be needed, but if your happy to sacrifice a few slots to reduce the end cost of attacks it is achievable imo.
In that case you can forget about getting EM Pulse, and probably EF for a long period of time (AVs)
So far I can run the toggles for a fair amount of time, but as said if you plan on supporting with damage too your going to feel the pain.
Dodging stamina in alot of builds is possible it's just tough but the extra variation of powers can help.
Clicking Hasten and Accelerate Metabolism at same time makes them almost perma (maybe really perma with some IO sets).
Could I avoid Fitness pool with A.M. always on? Maybe with A.M. and some APP power?