A long time ago, I posted this RFE: http://www.adom.de/forums/project.php?issueid=1536.
I don't want to continue discussion on said RFE, however - I want to have a community discussion of powers that can be applied to discourage people from using missiles and/or magic against a monster. The idea would be to have a range of creatures that are debilitating or what-have-you to fight with missiles and/or magic, but not melee. For example, (quoting from my RFE): "There's a fair number of creatures you really shouldn't, or plain can't in certain circumstances, fight in melee--karmics, of course, come to mind, as well many monsters with corruption attacks, [x] kings, things that paralyze you [if you don't have -Para], stat drainers [and not just wights, which can be fended off with PV, but lich kings, minotaur mages, greater daemons]...the list is quite extensive."
No such disincentives exist for missiles and/or magic. I would appreciate some ideas so I can post a fleshed-out RFE. Note that "powerful ranged attacks" (a la titans/greater titans) and "cannot use missiles against them" (a la doppleganger [x]) are not what I'm looking for: rather, I would like to see some sort of cost-benefit analysis involved (heavily weighted towards cost), such as is typically involved in deciding whether to go mano a mano with stat drainers or paralyzing creatures. Also, this would ideally generate a lot of ideas wrt spells as I've come to the conclusion that missiles are less important.
As a framework, consider an half-idea I had: summoning a ball spell could trigger an effect while a bolt spell would not.