[outdated] Caustic Arrow Solo Map MFer (20/300+)

I'm liking this league a ton! My thoughts are likely distorted in large part because I'm liking the original build I chose so much.

My original build...
I decided to farm the unique Oni-Goroshi sword from day 1. 8 hours after league start I dropped one. Oni-Goroshi is a 6-link 1-handed sword that occupies both weapon slots, and gives you a fire-damage debuff when you ignite an enemy along with a very nice DPS buff. The sword takes over your normal voice acting, replacing it with statements from the sword. This later part is itself a reason to get the sword as it introduces new voice-overs for much of the leveling content.

At any rate, the sword is extremely nice; it does more and more damage as you level.

I breezed up to maps 4 hours after dropping the sword (12 in total) in spite of spending 8 hours farming Twilight Strands.
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My goal for the Oni-Goroshi toon I'm now playing (as Jugg Molten Strike/Wild Strike) was simply to farm Uber Lab to fund a 2nd or 3rd character; in fact, my toon is performing much better than expected. I still plan to fund other toons, but my current character is more than capable of complete most challenges, but will struggle as a boss killer - and although Wild Strike is very nice for map clearing - it's not a top tier map clearing skill.
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This league, I plan on rolling 3 toons in total:
1) An Uber Lab clearer to fund other characters - my Oni-Goroshi toon is perfect for this;
2) A super fast map clearer that's not too bad at bosses (Deadeye Ranger seems perfect for this, with the additional arrow, nice movement speed and good defenses); and
3) A boss killer - Zizran's toon looks to be insanely defensive - check out the dual Uber Elder kill linked above.
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In short, this league offers a lot of fun - so many ascendencies have been buffed that numerous builds are uber powerful.
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League downsides:
1) Summoners have been unnecessarily nerfed given the huge buffs to other classes; if summoners were completely unchanged, they'd still be lagging behind several Champion/Juggernaut/Hierophant/Deadeye/etc. builds. The buffs to other builds make the summoner nerfs completely unneccessary;
2) It's buggy - this is the buggiest league I've played. Crashes, lockups, can't complete certain unique maps, etc. abound;
3) Beastiary mechanics are poorly implemented - legendary beasts are too rare; it would be nice to track what maps to run to farm certain legendary beasts; the necro-nets, although a nice addition, don't allow you to corpse target (work around this by equipping some corpse targetting skill); the UI for Beastiary recipies is confusing; etc.

All-in-all - the Beastiary League and mechanics to this point are very poorly implemented - if GGG spent another month developing Beastiary mechanics, I think that Beastiary would in itself be really fun; that said, the viability and power of so many ascendencies/builds overshadows the poor implementation of new Beastiary league mechanics.
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In all, a super fun league for me.

Last league I wandered between characters, leveling about 5 or 6 possible end-game toons to 85+, never settling on one or more as fit-to-purpose. As a result, I finished at 34/40 challenges. I enjoyed last league, but was disappointed in my progress.

This league, I'm pretty sure that I'll hit 40/40 - but I'm playing a lot more this league than last and I seem to have hit upon a super first toon, perfect for clearing Uber Lab and thus funding a map clearer and a boss killer as my 2nd and 3rd toons.