Ridley's Cohort
First Post
On one hand, it seems that a penalty to a Spellcraft check is the right way handle this. Just like you would handle Silent or Stilled spells.
On the other hand, some spell-like abilities are not really spells at all but simply require a comparable amount of concentration and therefore share spell mechanics, e.g. Lay on Hands. I would say LoH is more like a special kind of positive energy channeling in the spirit of Turning Undead. The argument could be made for some creature spell-like abilities as well, even if the ability is mechanically represented by a named spell in the PHB.
On the other hand, some spell-like abilities are not really spells at all but simply require a comparable amount of concentration and therefore share spell mechanics, e.g. Lay on Hands. I would say LoH is more like a special kind of positive energy channeling in the spirit of Turning Undead. The argument could be made for some creature spell-like abilities as well, even if the ability is mechanically represented by a named spell in the PHB.