Also, some Sight Stones (as I imagine we don't want 50 different kinds) could bestow multiple properties. For example a "Granite Sight Stone" might build from Cloth Armor, granting a bonus 15-20 AR, and give Ghost Wards an extra 2 hp, and an extra 2 minute duration. The bearer would have ~15 more armor, and the wards would have 5 hp (taking 5 hits to neutralize) and lasting 5 minutes. Or the numbers could be 20 AR, 4 hp, 6 mins; or some other such combination.
Another called a "Sapphire Sight Stone" might build from Sapphire, granting mana and dropping wards that penetrate brush and reveal stealth for their first 15 seconds (and then revert to normal wards).
There could even be a "Diamond Sight Stone" that stored pink wards instead of the normal ones, granting no other benefit.
These examples would all be the standard 4-ward max, two at a time variety, contrasted with the Ruby Sight Stone that gives 5 wards max, and three at a time.
Each of these different ward bonuses would play to different strengths & plays. It would also be important to be able to quickly pull item stats from the in-game [TAB] menu (so you know which sorts the enemy has, and what they do), though we should have that already.
Anyway, please comment and give feedback; I'm not being particularly rigorous here, but if someone else wants to be that'd be quite welcome. Thanks in advance,