https://www.reddit.com/r/Warframe/comments/4kycw7/ability_nuances_more_people_need_to_be_familiar/
Frosts Snowglobe - Does NOT scale with duration, it has used health values since update 12. If you cast snowglobe inside an existing one then what health is left will be added to your new snowglobe since update 15.13. It can be stacked like this infinitely up to a total health value of one million.
Hydroid Pilfering Swarm augment - Since update 17.0.4 Hydroids tentacles do not need to kill the enemies, only need to hold them. They do not need to do any actual damage, so you could have a negative power strength Hydroid and pilfering swarm will still work.
Mirage Eclipse - This is not an on/off ability. Testing has shown there is a gradient of power given.
Mirage Eclipse augment - Only works on physical type powers. It will buff attacks like Ashs Shuriken. If you leave the buff area you lose the buff.
Limbo - Lasers don't work while you're in the rift. Having trouble with moon spy? Rift walk and run around at a leisurely pace.
Nekros Shadows of the dead augment - With this he can get up to 90% damage reduction with a power strength of 215% making him rather tanky, along with his armour stripping 2 ability you can be so much more than a desecrate bot.
Oberon Smite infusion augment - It's a damage buffer which can give your (Oberons) power strength as bonus radiation damage. Buffs weapons and some abilities following the same damage types as Mirages eclipse.
Rhino Roar - It gives up to a maximum 149.5% buff to all damage types. What it lacks in power it makes up for in usefulness. If you're just doing draco however stick with Mirage for her ~600% buff or Frost/Ember/Volt/Saryn/Oberon for their respective ~300% buffs.
Chroma Effigy credit farming - To make the most out of Chromas effict giving you bonus cash, don't kill unless you need to. The effigy itself needs to kill enemies for the effect to work.
Equinox Pacify and Provoke augment - Makes night Equinox a good support frame. AoE slow, you want to tank a bit, an AoE heal (though it does require a bit of charge time) and a stun. I prefer night Equinox to Trinity when playing support, I can run around supporting as I need to instead of getting "EV?!?" spammed in chat.
Nova's Molecular Prime travels further when you increase duration. NOT range. Only the explosion radius on death is affected by range.
Nova's Antimatter Drop is NOT affected by range. Strength only affects the base damage, NOT the absorbed damage.
Nova's Null Star increase in number with more duration, NOT strength.
Valkyr - Warcry: While affected by an allied Valkyr's Warcry, you can move into Nullifier bubbles without the buff being removed. Only when Valkyr enters a bubble, the buff will be stripped off everyone immediately.
Valkyr - Eternal War (Warcry augment): The duration of the party members' buff is directly tied to Valkyr's buff duration. So if you want to have a longer Warcry buff to continue your own melee rampage, don't steal all kills from Valkyr so she can prolong your own buff. You're helping her (and yourself) by not helping her.
Equinox Mend and Maim - The absorbed damage from kills for Mend and Maim is NOT affected by power strength, only the constant slash damage is. If you're using a Maim nuker build, negative power strength is fine.
Ash Bladestorm - A few things here that a lot of people don't seem to know... Bladestorm is only affected by attack speed mods, not by any other weapon mods OR weapon attack speed. Combo counter on Bladestorm IS affected by Body Count, so combining Body Count with the Rising Storm augment can give a very long combo counter. Rising Storm augment is affected by duration mods, so using it with 12% duration is not particularly useful.
Shield Polarize - Each shield-drain explosion does not harm the enemy whose shields are drained. It will only harm other enemies in the explosion radius. Also, that damage diminishes (a lot) with distance. Getting enemies clumped up close together will provide a bigger buff to SP damage than any buffer can provide.
(I will clean this post up later)
