If the enemy jungler is a Da Ji, or an Ao Kuang, you absolutely need purification beads. Or if you're up against an Artio, or something like that. Usually however, you want blink for the enormous amount of pressure it gives, or allowing you to equalize with the enemy if they get there first. Also, the way you clear your blue is extremely important. This is how you do it. Auto Attack, Auto Attack, Overhead Slash, Auto Attack, Pause and wait a very short amount of time for the second spirit minions to spawn, when they do, Hamstring, then auto attack until it's dead. If done right, this should put the camp at 250 health which is exactly 5 autos because with the bluestone buff, your autos do exactly 50 damage to the camp.

Here is a quick chart on knowing what to build depending on the enemy jungler and solo laner's type. Physical Solo/Physical Jungler: Sovereignty, Gladiator's Shield. Physical Solo/Magical Jungler: Sovereignty, Genji's. Magical Solo/Physical Jungler: Genji's, Glad Shield. Magical Solo/Magical Jungler: Genji's, Bulwark. OH, and one more thing, you need blue buff and a 500 pot to get 40% cdr with this build, Which usually isn't hard, but if you think it might be a problem, consult the situational items below.

If you find yourself being locked down and killed in fights by cc, or can't get the kills to stack urchin, then get spirit robe. If the enemy team has 4 physicals, consider going void shield instead of bulwark of hope. If the enemy solo laner is anubis or a god that heals a LOT, get pestilence (Do not get pestilence against Artio, Chaac, or Cerberus, it's a waste). Talisman of energy is fun. that's about it, get it if you want. Contagion is for being against 4 or 5 phys who have a lot of healing, Spectral Armor for crit, Mantle is more expensive than urchin and robe, but if you have the gold and don't care for free shields then sure, Pridwen on Arthur is a mixed bag. It is very greedy, as it might leave you a little more vulnerable due to it having 21 less prot than a fully stacked urchin, and no shields, and having 10 and 30 less prot than a mantle or a spirit robe, with neither's defensive passive. Only pick it up if you can afford to (being ahead) and if you prefer it over hide of the urchin (I personally don't). Mail of Renewal can be a good option if the rest of your team doesn't have a great teamfight to support you diving, or doesn't have any on-demand healing. Runic Shield is for when you're up against 4 or more magicals, and one day, when it's hopefully buffed, you can get away with building Oni Hunter's Garb. ONE DAY HI-REZ. ONE DAY.