What is this rune system I keep hearing of?

Q: What is this rune system I keep hearing of? It is strange and confusing to me!
A: The rune system is a rather confusing energy system by comparison to the already existing ones, as it stands you use your runes for initial strikes and spells, such as plague strike, blood strike, icy touch and obliterate, to name the staple tools of a rotation, some skills cost 2 runes, these being Scourge Strike, Obliterate, Death Strike and Howling Blast.
All abilities that require one rune generate 10 runic power on use, two rune abilities give 15 (some abilities will generate an extra 5 with talents.) Runic power is then used for secondary abilities.