Olgar Shiverstone
Legend
Does that make the Bishop the most powerful piece on the board?
That's Cleric's Chess!
... and the rook provides turn resistance in a 2-square radius.
Does that make the Bishop the most powerful piece on the board?
A lich has a pretty high turn resistance
Aside, you might hit your own lich.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.