i think the most effective way to implement it would be adding a glossary inside the game.
reasons:
- forums are browsed by people who have time/put lot of effort in the game...often casual people don't even look at it.
- easy to see and recognize, quickly accessible by anyone
- not distruptable (if this is a issue)
at the very least updating tooltips would be much better than creating a glossary (and probably faster for you).
Ie current tooltip: Yillia's wrath --> target gains vulnerable and bane attribute for 2 turns.
The skill description isn't really self explanatory i would say...maybe converting it into -> Yillia's wrath -> target gains vulnerable attribute ( damage received increased by 3) and the Bane attribute (damage done increased by 3)