Appirits, the Japanese developer of their English turn-based browser game Einherjar - The Viking's Blood has recently announced a brand new event based on Lightning skill theme for their players from 8 to 15 May 2013 (GMT+8).
During the aforesaid period, there will be 2 new materials which players can obtain through Sacrifice and Expedition. One is Lightning Stone (for Sacrifice) and the other is Lightning Talisman (for Expedition). Sacrifice is a unique feature in Einherjar which allows players to donate their units to the gods and get special items in return, while Expedition is a feature which help players gain valuable items through numerous battles on the world map. The develper notes that the Lightning Stone will appear in Sacrifice at a certain rate only and the Lightning Talisman can be collected on all maps with different drop rates.
Then combining those 2 materials in the Event tab will result in 2 crystals of Lighting Attack and Lightning Trick. Once again, there will be a certain success rate applied for this skill crystal production. So players may fail sometimes but it is recommended that they should not give up on the valuable chance to obtain Lightning Attack and Lightning Trick skills.