[u]Why make this guide?[u]
Yesterday, I saw an interesting question in the Help channel: "What's the best team debuff?" This immediately peaked my interest. Ignoring the lingering question "Why would he want to debuff his own team?" I decided to get to work on a build for team debuffs.
[u]Builds[u]
There are many builds that you can use for this matter, so I chose to list some powers from different power pools.
Gale
Ahh, Gale. The infamous power you're forced to choose if you took storm summoning as a secondary, or maybe you chose it anyways as a defender. This is a great power for annoyance if you want to run through the sewers blasting away Vahzilok from tanks, scrappers, and other melee-oriented archtypes. But, like good things can be used for evil, evil things can be used for good. For example, if you have a flight power, Gale automatically becomes a knockdown power. But, if you don't have any flight powers, use this to blast away foes from squishy blasters or defenders, or maybe a scrapper in over his/her head.
Whirlwind
Behold! The might of Whirlwind, the almighty Endurance draining, loud, knockbacking, and pretty much useless power. All you have to do with this little gremlin is fill up your inspiration tray with endurance boosts, resist/defense boosts, a few respites, and jump into a mob! I can't really see a redeeming quality in this, but feel free to disagree.
Repel
Aha! That tempting power in the Kinetics pool. Don't do it! It might not drain as much endurance as Whirlwind, but the accuracy is awful, and you won't be needing the knockback anyways.
Black Hole
And we move on to Foe Intangibles. This can be very annoying if you are on a team that isn't getting murdered, but very useful if your team is getting murdered. Just warn the blasters before they try to nuke the affected, or should I say "Unaffected" foes. Use the same strategy for other AoE foe intangibles.
Detention Field
This barely made the cut for this Hall of Infame. Sure, a tanker might get freaked out when their fully slotted for Acc powers don't work on the boss you just "bubbled", but this is a very useful power for defense.
The End
Feel free to post more powers that make you smash your keyboard like an angry German!