Skill Combination Effects

Some heroes' skills can be combined to create an additional effect. (These were all I could remember, I would appreciate assistance with the rest. -siege)

United Creeps

Nightmare + Spire

• Units hit by spire under the effects of nightmare will be frozen for a short amount of time and damaged (broken in 1.12)

Encouragement + Rebirth

• When a unit enchanted by rebirth is sacrificed by encouragement a flying unit is spawned from it's corpse

Nightmare + Howl

• Waking units from a nightmare with howl deals damage and instantly wakes them

Elven Brigade

Flame of the Devout + Dash

• Dashing through the flame leaves a burning trail behind that deals damage to enemies that come into contact with it

Backfire + Syphon Sigil

• Using Syphon on a hero with Backfire on it will cause the Glyph to drain mana and deal damage instantly rather than over a short period

Maelstrom + Incinerate

• Incinerating the tornadoes created by Maelstrom will light them aflame, adding unit damage to the existing building damage effect

Grim Brigade

When Divine Wizard casts holy strike on High Oracle while she is channeling ki blitz, the healing orbs have a mini holy strike effect on them as they fly through the air.