From Dual-Boxing Wiki

Description

This is a simple macro that does a cast sequence with Flame Shock, Lava Birst and Lightning Bolts. When a modifier is pressed, Chain Lightning is fired.

Macro

/castsequence [nomod] reset=7 Flame Shock, Lava Burst, Lightning Bolt, Lightning Bolt, Lightning Bolt, Lightning Bolt, Lava Burst, Lightning Bolt, Lightning Bolt, Lightning Bolt
/cast [mod] Chain Lightning