I was out hunting Hyungno Soldiers the other day and after I killed a group of them I noticed that about every 3 seconds I was taking about 30-40 HP of damage. There was nothing around that was attacking me, that I could tell. I ran around the land a bit thinking I was just missing something, but the damage kept coming. Each time the "block" text came up for my shield too. I used a return scroll to get back to donwhang and it stopped.
This never happened to me before and I don't know what was causing it. Just before the damage started happening, I got done using my fire damage skikk (I forget what it's called - increase damage by burning own body) and the fire shield skill for protection against magic. I seem to remember reading somewhere about being careful using the body burning skill. Is there truth to that? Can that skill actually harm you?
What else could have caused this? If that skill does that, maybe I should stop using it

Missing the good times in SRO... 
SRO:
1x, STR Blader (Thebes)
54, STR blader (Venice)
0x, INT wizard (Venice)
19, INT spear (Venice)
34, STR rogue/bard (Venus)
0x, STR blader (Venus)
8x, INT bard/cleric (Gaia)