It's been a while since my initial release of those descriptions, and a lot of things need to be changed. A few mistakes here and there, but also plenty of mechanics changed on rAthena whose descriptions need to match that. Yes, I'm looking at you, Enchant Deadly Poison.
Let's not drag this too long, yeah? Here's some patch notes:
Typos fixed on the following skills: Shield Chain, Cart Boost, Cart Termination, Watery Evasion/Suiton
Updated Cart Boost to account for the new interaction between this skill and Please Don't Forget Me(it no longer cancels the effect)
Weaponry Research: Includes information about the Hidden Bonus(battle.cpp, line 3269)
Raid: The debuff only applies in Renewal
Venom Splasher: The timer information was completely wrong. Corrected and now also includes cooldown, additional information added on comments
Jupitel Thunder: Was missing any information regarding damage
Explosion Spirits/Critical Explosion: Corrected information, the SP recovery is disabled, not halved
Blitz Beat: Corrected damage on information, improved wording
Head Crush: Corrected ambiguous information about bleeding
Shield Boomerang: Information about damage calculation
Shield Chain: Massively expanded on the information and comments, including comparisons between this skill and Shield Boomerang
Dispel: Clarification on the fact that MDEF reducing the chance is a myth that never existed
Land Mine: Damage information completely wrong, fixed now including Mercenary version
Freezing Trap: Added information on damage and scaling
Blast Mine: Damage informationm missing, durations wrong too, fixed now
Claymore Trap: Damage information missing, fixed now
Gravitation Field: Included information about the secret property of the skill, where damage ticks count as auto attacks
Throw Zeny: Accurate information about reduction versus players and bosses
Final Strike: Added a a note, pointing out that Hercules uses a stronger formula for the skill
Grand Cross: Greatly improved description
Throw Kunai: Changed to reflect changes on rAthena(no longer misses, pseudo elemental)
Throw Shuriken: Same as above(even more nerfed than kunais, why did you guys ever do this?)
Steal: Massively improved description with more information and insight on High DEX/Low DEX
Envenom: Improved damage descriptions
Left/Right Hand Mastery: Recent information about the skill's inner workings
Enchant Deadly Poison: Updated to the latest details of the skill, post the recent rework
Next update I'll include the monster skills that were requested. I'd also like to expand upon this by adding quick reference pages in-game, containing information such as Status Effects, monster skills, etc.
I updated the first post to have the latest version, but I'll leave it here as well just in case.
skilldescript.lub