Onslaught Branch Crafting Process
Perfect fossil until 30% quality.
Alteration until Merciless. I just so happened to also hit T1 Attack Speed, but this did not end up mattering.
Imprint.
Regal for any mod that can be seed crafted away/changed.
Craft Physical Damage Leeched as Mana from the crafting bench.
Use any variant of remove non-physical, remove/add physical, augment physical or "ghetto augs" (remove non-fire and augment fire, then remove non-physical and augment physical) until Flaring.
Use similar seed craft variants until T3 Hybrid.
+2 arrows was obtained by crafting Cannot Roll Attack Mods, augmenting attack, augmenting cold, then using the remove/add attack seed craft until +2 arrows. Please be aware, this method of crafting +2 arrows was patched out today. I actually finished the prefixes and +2 arrows 50 minutes before the patch that would make it significantly more expensive.
Remove cold.
Divine prefixes.
Craft on attack speed with the crafting bench and use remove/add attack speed seed crafts until T1 attack speed. Use randomize seed craft for attack speed until perfect.
Craft on Critical Strike Chance + Quality. Recraft (or randomize seed craft for crit until perfect.)
Vorici 3W and then use reforge a random socket to white until 6W.