The Igniting Standing Stone is a block added by Roots. It will set fire to all mobs inside its 9 block radius when powered by Redstone. Each 20 ticks (or each second) all mobs inside its radius will set alight for 3 seconds.
You've used standing stones to channel life energy before, but never on their own. However, using the innate power within an infernal bulb and the regenerative effects of a ritual, you have created standing stones that will perform a simple purpose in an area around them forever, without cost.
The igniter stone will light nearby creatures on fire for a few seconds.
— Runic Tablet
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