LogFAQs > #942243286

i115 = item level 115
item level = relative gear strength; all your stats rise as you equip higher item level stuff. increases steadily as you level, then there's a range of item levels at each level cap as each new patch introduced stronger endgame gear to collect
poetics tomestones = a type of currency, used specifically for gearing up rapidly at levels 50/60/70: press ctrl+c to view currencies. you get these by doing lower-level content, especially when on a higher-level class during roulettes

poetics gear essentially puts you at peak strength for that expansion. you'll continue to outpace any gear dungeons/crafting will give you for a few levels onwards, as well, especially if you augment it (which just makes it a little stronger in exchange for a little more poetics)

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raytan and Kana are on opposite ends of the Awesome Spectrum.