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Dealing Cryo damage to an enemy grants a stack of Avalanche (up to 100 stacks), which grants the following buffs:
Only one stack of Avalanche can be gained from any given enemy.
Stacks decay over time, and decay quickly if the player deals incendiary damage or becomes Crippled.
- Up to +75% cryo damage and +40% freeze chance can be stacked at rank 5.
- Stacks begin decaying approximately 40 seconds after last gaining a stack, with subsequent decays occurring approximately every 25 seconds. This makes it fairly easy to maintain or even gain stack levels if moving quickly enough between areas with enemies. If Aurelia deals incendiary damage to anything including barrels or objects, stacks begin decaying quickly, beginning at a rate of one every 5 seconds, accelerating after that for each subsequent incendiary attack – even against the same enemy. Dealing Cryo damage to a new target 'resets' the decay rate, allowing the player to gain stacks once more.
- Stacks persist through map changes – including using fast travel – and embarking or disembarking vehicles. The Stingray's cryo missiles don't add to stacks, nor do they refresh them.
- Personally detonating a cryo barrel – whether near enemies or not – does not add any stacks. However, detonating an incendiary barrel near an enemy causes stacks to decay at the normal rate.