Two important things to note here Feanor:That's about Nizzy : isn't too much to give him Insect Plague ? I mean I totally agree to improve Dragons abilities to fight in melee, but, still, I think they should be weak spellcasters.
- Nizi already had the Insect Plague ability, and uses it every time you battle him in SoA, just as he uses Planth Growth (an more powerful version of the druidic Entangle).
- Dragons are good spellcasters with or without Refinements. They have hundreds and thousands of years to learn and aquire every kind of knowledge, and they are indeed very adept in using magic. Dragon magic works somewhat similar to the classic magic system, but it has its unique characteristics as well. Let me quote the following lines from the 2nd E MM about Dragon magic:
Dragons learn spells haphazardly over the years. The DM should randomly determine which spells any particular dragon knows. The dragon can cast each spell once per day, unless random determination indicates the same spell more than once, in which case the dragon can cast it more than once a day. Dragons to not use spell books or pray to deities; they simply sleep, concentrate when they awaken, and remember their spells. Dragon spells have only a verbal component; the spells have a casting time of 1, regardless of level. Dragons cannot physically attack, use their breath weapon, use their magical abilities, or fly (except to glide) while casting a spell.