I found the ultimate tip on armour sets, okay now with cyder and spyro the last armour set has a ability called fury breath, this works when you double tap up or left, etc the point is that you will notice you have the same symbol as your fury attack breath.

When facing elite enemies look at the color of its helmet. Then select the type of element that goes with that color. Atack it with that element untill the mask falls off. Then use regular atacks.

OK, so last night me and my sister were playing two-player co-op on DotD. We're at the level where we have to destroy all the crystals on the Destroyer.
We were flying around an area with lots of geysers and enemies and with low HP and no MP (because of the crystals, and I know it's called mana but I call it MP).
Both Spyro (my sister) and Cynder (me) got whacked by an enemy.
(here's the glitch)
Cynder began spiralling around the way that you do sometimes when you die, and when my sister made Spyro pull Cynder to a ledge (because I couldn't move anymore) Cynder collapsed to the ground in a dead pose -
- BUT SHE WASN'T EVEN DEAD YET!!!
One of the enemies then walked up and killed Cynder. Glitch fixed. <img src="http://i.neoseeker.com/d/icons/smile.gif" border=0 vspace=2 alt="" />
I have no idea how it happened, but it was so funny XD XD XD

Alright, this only happened once per player but if you have just got your first complete set of armor, equip it to activate the special ability, leave it on a while and play the game, then when you take off the armor you still have the ability... for me it was Spyro's "Nuclier Hit", and Cynders "Regenerating health" which I realize isn't a full-set special ability. Hope it works for you too!!!