Tried a throwing Legend Build with throwign axes 20 mutation warrior/20 bloodrager primalist
Javelins aren't light (and neither are darts surprisingly...) so TWF with them has more penalties
Anyways here is the test build. Mods used: TOybox (for levelup and equips), Tabletop tweaks (has some options for Advanced Weapon Training and bloodrager bloodlines)
Started with half-orc human raised (for +2 skill points/level) and 7 str/18+2dex/14 con/14 int/10 wis/12 cha, pickpocket background, feats point blank shot and precise shot.
Ended with this
Attacks are 4 (BAB)+1 haste +1 Rapidshot = 6 in MH and 3 Greater TWF in OFfhand for total of 9 attacks per round at 30 feet range.
The Temp HP is False life greater + Bloodrage bonus.
Equips: +8 perfection belt and hat, +8 bracers of armor, +6 natural Armor Necklace, +6 ring of deflection, +6 cloak of resistance and +5 throwing axe (eye gouger) in MH and +4 throwing axe (nordic welcome) in offhand.
Note that the stats are with self-buff, mutagen, said equips, bloodrage and grand mutagen. if you add a Bard, a skald with lethal stance, a Judge, a brown fur transmuter etc... these stats will become even more hilarious
Bloodrager bloodlines (Destined and Aberrant) chosen for immunity to as many statuses and always active blindsight, critical hit / sneak attack immunity etc. Not to mention that Destined gives +5 luck bonus to AC and saves.
No Primalist bloodline to rage power swap was doen as I think the immunities are better. (and u can get a skald to give you totems/stances)
Mythic abilities are Endless rage @ lvl1 and Extra mythic ability:Second Bloodrager Bloodline - Aberrant bloodline