Tome of Knowledge is consumable item. The idea is simple. Let's say you play "carry". You need a comfortable environment to farm. someone can ward the map for you. Besides, he can go to their "nc" and annoy enemy heroes. This support hero need tome of knowledge. he deserved it. Carry can buy it for him or just let him buy for himself.(better buy it for him because he is not farming like you.)
Tome of Knowledge is an early game item purchasable from the Consumables section at the Home Shop. Starts out of stock, and increments stock every 10 minutes. The stock limit is a maximum of 3 tomes. This item stacks with itself in the inventory. Fully shareable. Increases in power as more tomes are used.
Here, lich took the tome of knowledge without knowledge of mortred.
Let's see the details.
min13:00
Mortred bought tome of knowledge. the tome of knowledge was located on circle of power of Mortred.
Min13:08
Courier of lich grabbed the tome of knowledge from the power circle of Mortred. The courier delivered it to lich.
Min13:38
Lich consumed the tome of knowledge which belongs to Mortred.
13:33 Saiyan. [Allies] ok
13:35 Saiyan. [Allies] who stole me
13:38 Saiyan. [Allies] tome?
14:03 Saiyan. [Allies] who stole my item?
14:09 Saiyan. [Allies] ok
14:10 Saiyan. [Allies] reported
it is just an 150 gold item and it is a shareable item.But he took it without permission.
-newgatebranca (https://dota.eurobattle.net/la/forum/index.php?action=gameinfo;sa=player;sid=1;nick=-newgatebranca) !Banned 1 day + 1 warn point due to Stealing.