If you are not affliction (lets say destro):
2 second cast
half the damage of your immolate
Doesn’t benefit from various multipliers (for example the one that boosts fire damage) and doesn’t grant you anything like soul shard generation.
Like why? What’s even the point? Just to copy classic? In classic even for destro corruption did more damage than immolate and you could put 5 talent points in first row of affli tree and make it instant.
only useful thing we got in sl was circle rest was like socks for christmas , y u can use them at least to get a spell reflect off( curse of weakness ) , but in the end that was it rest gets deleted with a global