Any advantage taken with the Cyclic enhancement and the Resistible limitation can be made continuous - the victim keeps taking damage until he makes his HT check or is cured. The enhancement value depends on the base cost and the penalty to the HT check:
| HT-5 | Base cost × 20 |
| HT-4 | Base cost × 10 |
| HT-3 | Base cost × 6 |
| HT-2 | Base cost × 4 |
| HT-1 | Base cost × 3 |
| HT | Base cost × 2 |
| HT+1 | Base cost × 1 1/2 |
| HT+2 or better | Base cost × 1 |