You must beat the boss of lair of death go into the gate after you beat it then destroy chaos orb and master of chaos will appear.
Tikal sealed herself in the master emerald with Chaos.
either the master emerald or a chaos emerald
The ice trinket in Swordigo is located in the Twilight Temple. You can find it in a secret room that is accessible only after defeating the boss in that area. Look for a breakable wall near the boss room to get the ice trinket.
The Master Emerled is, well, the Master of the chaos emerleds. As to how it broke, Chaos was sealed inside it along with Tical. When Chaos was released, the master emerled shattered and Tical's soal was also released.
Dance
In the fiery depths
Kill the guys
Chaos is a Water-ish type of creature who came from the Master Emerald, also if you feed him a Chaos Emerald, he will turn more powerful: Chaos 0, Chaos 2, Chaos 4,Chaos 6 & Perfect Chaos.
No
The origin of the Chaos Emeralds are unknown, all that is known about them, is that the Chaos Emeralds have existed for millennia along with the Master Emerald.
Chaos Control, Chaos Blast, etc. The Gray Emerald had the power to control the other Emeralds kind of how the Master Emerald does.
Same as fire red since chaos black is a hack.