For each skill, there are 3 main sections
- Header - This top section includes the skill name, a short description, and up to 4 lines of description that in v1.7 I've been using to share information about the skill that never changes as the skill levels. For example the resistances of a summon (set by monstats.txt), a next-hit delay (set by missiles.txt), etc. Sometimes a skill's effects in the Header are changed by their synergies.
- Level Stats - This middle section includes stats that change as the skill gains levels. Some changes will occur only after a few levels, but in almost all cases if I've placed a stat in this section then it will eventually change as the level increases.
- Footer - This bottom section is where the synergy information is. There are 6 lines of description allowed, so in some cases I couldn't put every detail. In cases where I just put a skill name (e.g. Enchant's synergies), then that synergy benefits every stat in the skill (e.g. ShiverArmor gives Enchant %ARating, Duration, and +2%Dmg; ChillingArmor gives EShield 1%AbsorbDmg, -1/16th MPperDmg, and Duration). WarCry is a notable exception, since it's synergy with Energy is capped at +120%MagicDmg, so I remove that synergy line if you've reached the cap (I don't recommend trying to reach the cap since it would take over 300Energy, but it might be fun to try).
I don't remember the details of v1.5 or v1.6's skill descriptions, but compared to v1.3 the skill descriptions of v1.7 are very transparent. There isn't much more to know than what is already listed.
If you have any questions about skill descriptions, feel free to ask. There's a good chance that I've forgotten to mention some special case, so if you notice something odd, then I don't mind explaining it.