Orbs is the main free ingame currency used for purchasing Card Packs. Players get Orbs by killing creatures and opening chests in Shards. Significant amount of Orbs can be earned by finishing Daily Goals updated everyday.
Total amount of Orbs a player can collect from one Shard depends on Shard's relative difficlulty and it's average playtime needed to finish the Shard.
The Shard owner who built it has no way how to put Orbs in his/her Shards, the game sets the amount particularly for each player who visits it.
Health Orbs
Health Orbs are red and heal the hero immediately when collected. They drop from killed creatures, opened chests and destroyed vases, barels and similar objects.
Charge Orbs
Charge Orbs are green and add one extra ability charge when collected. They drop from killed creatures, opened chests and destroyed vases, barels and similar objects.