Summoner Demystified: A Guide for Beginners

[Sleigh]

Hi there, I'm leveling SMN and just hit level 40. Is there any compelling reason to use Ruin over Ruin II? Mana is not an issue for me at all.

While it's still bad form to spam Ruin II over Ruin, this was a much bigger deal pre-2.5 (or some 2.5X patch) when they reduced Ruin and Ruin II's cost. Post-reduction I'll admit you can get away with spamming Ruin II over Ruin in a lot of fights, including raids, but it's a very bad habit because the fights where MP won't survive (like Savage A2, kinda A3 and A4), or if shit hits the fan and you want to use Resurrection or re-summon a cleaved Garuda/Ifrit, you'll be in the weeds MP wise.