Calculating Spikes Damage

as quoted from Apple,

As for any spikes spells, the damage is only determined by our INT. Enhancing magic skill helps them to do full damage instead. That is to say, the higher we have the skill, the less they're resisted.

Here's what we have so far for spikes spells.

Blazespikes integer [integer ((INT + 2) / 12 + 4) * Magic Atk. Bonus]

Ice / Shock Spikes integer [integer ((INT + 10) / 20 + 2) * Matic Atk. Bonus]

Magic Atk. Bonus RDM20: 1.20 RDM40: 1.24 Moldavite Earring: +0.05

For example of RDM74 with 74 INT:

Blazespikes integer [integer ((74 + 2) / 12 + 4) * 1.24] = integer [integer (10.33.....) * 1.24 = integer (10 * 1.24) = 13

Ice / Shock Spikes integer [integer ((74 + 10) / 20 + 2) * 1.24] = integer [integer (6.2) * 1.24] = integer (6 * 1.24) = 7

original thread http://www.ffxionline.com/forums/showthread.php?s=f44462e773489d70364206b28192b7a4&threadid=49010&perpage=14&highlight=enhancing&pagenumber=3