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Paralysis damage is a special damage type inflicted by various effects such as the Paralyze spell and the mind blast weapons of creatures such as illithids and great olms.
The damage inflicted appears to vary with the usual DRN, but this roll is not shown1).
The number of turns of paralysis is then given by
Duration = (Paralysis damage after DRN - target [[size]])/2
If the target was already paralysed, the creature then loses health (that is to say no DRN is involved) equal to:
Health loss = min(old duration, new duration)/2
To a maximum of 5 points of health loss from a single additional paralysis effect.