Originally Posted by
Endus
It's useful for multiple targets, I'm avoiding a huge writeup on AOE right now because there's some major incoming changes to that in 4.1, but basically unglyphed CL is great for 2-4 enemies. If you've got 5+, you're better off dropped Magma Totem and spamming Earthquake.
I'm currently running with glyphed CL, since it's handy for Cho'gall adds, and there's honestly not a lot of cleaving to 2-3 targets outside of Halfus normal without whelps or trash packs, neither of which I care much about. Glyphing CL also has an interesting side benefit; each "jump" on a standard CL has the same combined chance to proc Rolling Thunder as a Lightning Bolt, so it works out to 10% per bolt, 30% for the basic CL. Glyphed has the same per-bolt chance, pushing it to roughly a 50% chance to proc RT, and highly increasing the chance for multiple procs and the chance to proc Clearcasting. I find this handy for the few trash burn phases we've got in current content. But that's by no means a requirement, just something I'm playing around with.