Interesting puzzle-like mechanic in this gold challenge.
Having played them all, here are my thoughts:
Bronze Challenge - very well rounded and a good challenge
Silver Challenge - good demonstration of the crusader's scarred ability, but much too easy for a silver challenge.
Gold Challenge - creative puzzle mechanic, but laughably
easy for a gold challenge. I almost won it on my first try; if I hadn't picked up the alchemist's pact I wouldn't have leveled up one extra time and I'd have won.
Bronze is simple even if you don't use Pactmaker (which I screwed up on by taking a pact before taking Consensus). It's not hard to get over 100 damage with Crusader if you level up efficiently, like with IMAWAL. I think I beat it at level 6 with no conversions.
You don't need Pactmaker for any of these. He's not particularly useful in any circumstance here.
I personally would avoid IMAWAL unless you're about to cash in on a lot of bonus experience. It deprives you of the popcorn you need to fuel your momentum.
Can't figure out Silver at all.
What's to figure out? This boss's damage is pathetic and his only strength is above-average health and that corrosive strike. Just make sure you're adequately leveled and he goes down pretty easy. I barreled through him by brute force without even paying attention to momentum.