Drains 30% of your Maximum HP when used over the course of 30 seconds. If you have 1000 HP, you will lose 10 HP a second. However, this can be partially ignored by wearing the Lingering Dragoncrest Ring +2, which extends the spell effect to 42 seconds, thus making the damage accumulate, or "tick", slower. This is probably the best Body Buff in the game, as it gives you the greatest damage buff, while also making your Stamina regenerate much more quickly. The downside is negligible if you have some form of Health Regeneration, if you even care to lose 30% of your maximum life over 42 seconds. After all, the downside doesn't even matter if you never get hit, so go wild and use this instead. It has low requirements, so most builds will be able to use it fairly easily.
9/10, the most impactful Body Buff in the game. Actually gives you a decent damage buff, and extra Stamina Regeneration, with a minimal drawback.