I knew much honour. But no longer exists. I knight from the past. Yet in a serie I am called Jack. Now don’t fear my blade, and guess my aid. What am I?

Cloven, clever piper, Eponym to freezing shock, A name long cast in iron, Fits well among the flock

I make you a demon, a monster, a beast, A pale faced jester some like the least. I'm on many heroes super, The corpse of many kings, Tragedy and Comedy: I'm the icon of these things.

I can bind kings and free slaves. I build empires or tear them down, But only if I remain hidden.

Born of earth yet prized as sky, I wear green calm where secrets lie. I harden patience, not with flame, But time and pressure stake my claim. Kings wore me for luck, not blade, Name the stone that peace has made.