Guild Wars 2

Arcane Power + Elemental Surge with attunement switch can produce interesting effects.

For area “tick” based spells (Lava Font, Unsteady Ground, Glyph of Storms), Arcane Power seems to be applied based on the attunement when the tick hit. Using Earth storm as examples:

1. Earth storm with 5 ticks of immobilize:
   Earth Attunement -> Arcane Power -> Glyph of Storm -> wait for 5 ticks.
2. Earth storm with 1 immobilize tick then 4 chill ticks:
   Earth Attunement -> Arcane Power -> Glyph of Storm -> wait for 1 tick -> Water Attunement -> wait for 4 ticks.
3. Earth storm with 1 immobilize tick then 1 chill tick then burning:
   Earth Attunement -> Arcane Power -> Glyph of Storm -> wait for 1 tick -> Water Attunement -> wait for 1 tick -> Fire Attunement -> wait for 3 ticks.

For delayed hit spells, Arcane Power seems to be applied based on the attunement when the spell hit. Examples:

1. Ice Spike with immobilize:
   Water Attunement -> Arcane Power -> Ice Spike -> Earth Attunement before Ice Spike dropped.
   Or, Water Attunement -> Ice Spike -> Arcane Power -> Earth Attunement before Ice Spike dropped.
2. Lightning Surge with immobilize:
   Air Attunement -> Arcane Power -> Lightning Surge -> Earth Attunement before Lightning Surge hit.
   Or, Air Attunement -> Lightning Surge -> Arcane Power -> Earth Attunement before Lightning Surge hit.

For Staff Ele, Elemental Surge + Arcane Power combo examples:
1. Arcane Power → Fire Attunement with Sunspot trait = Sunspot with burning.
2. Arcane Power → Air Attunement with Electric Discharge trait = Electric Discharge with blind.
3. Eruption (E1) → Fire Attunement → Arcane Power (before the blast) = Eruption blast with burning. If you have Sunspot trait, this will not trigger Sunspot to burn or use Arcane Power charge.
4. Eruption (E1) → Arcane Power → Fire Attunement (before the blast) = Eruption blast with burning. If you have Sunspot trait, this will cause Sunspot to burn.
5. Lava Font (F2) → Earth Attunement → Arcane Power = Lava Font with immobilize.
6. Water Attunement → Arcane Power → Signet of Air = AE blind + AE Chill.
7. Earth Attunement → Glyph of Storm → Fire Attunement → Arcane Power = AE bleed + burn.
8. Eruption (E1) → Ice Spike (W2) → Fire Attunement → Arcane Power = Eruption blast + Ice Spike with 2x burning.