Dark Souls by finding potent tactical combinations, like casting Iron Flesh and Homing Soulmass in tandem to turn yourself into an invincible, automatic killing machine? Well, you can't do that anymore: Dark Souls patch 1.05 was recently released, adding a handful of new features, tweaking a few abilities and outright nerfing some spells, including the two mentioned above.
The update is the same as the Japanese patch that went live some time ago. You can check out a full list of translated patch notes over on Eurogamer. Many condolences for the imminent death(s) of your poor, poor hero.