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it's an augment...not effective till 65 though.
gives good stat and saves bonus (all)
I don't know where you get your info sometimes Psycho.
Adventurers stone is a 'Charm' Slot Augmentation effective from level 20 that for every 10 wins in a particular LDoN style gives you +1/+1 Hitpoints/Mana and every 100 wins <in batches of 10> +1 to all stats and saves. While it has a 'Recommended level 65 at 59 i have had no decreasein effectiveness.
Note: it doesn't seem to be a flat increase some '10 wins' may give more than standard +1/+1 it may be that if you have 10 wins in 2 seperate zones it starts giving +2/+2 per '10 wins' but as i don't LDon a huge amount that is pure conjecture as i can't prove it
i have +5/+5 with 25 wins in BB and 12 in Nro with 7 more in the other 3.