Anyone know? Personally I don't see much defence being given.
How much defence does the defence orbs ,dropped by enemies;caused by seraphynx, give?
OP was asking about how much armor is added, not how long the armor is added. Time-wise, it starts at 14 and increases every next cast if multiple were obtained in the previous cast (resets every depth).
As for the armor... I don't notice much at all either. I can attempt to find out in a bit.
I did some damage tests in OCH (first depth).
Wearing chaos... (31 total hp, i had a 12 vita)
A darkfang thwacker's first basic attack dealt me...
17% hp damage without the defense boost (from 100%)
13% hp damage with the defense boost (from 100%)
As far as I know defensive buffs act on your current armour set. So using using the drake set will not give normal defence but buff the stats you currently have. The defence boost may be a static number or a percentage but that will take some testing across a few armour sets to figure out. Defensive buffs have always been a oddity since they appeared not long ago and some of us are still trying to figure them out.
Now that I think about it... it probably is approximately a UV med boost for all damage types. I wonder if it also reduces status...
http://forums.spiralknights.com/en/node/89471
15%-20%. Please note that this isn't even close to meaning 15%-20% less damage taken. It means 15%-20% more defence. This will mean maybe half a pip less damage.
It's likely random or 28 seconds of defense.