At 80% LTV (Warning LTV): Notice period. Email notifications every 6 hours. Options:

• Top up collateral (deposit more BTC/ETH)
• Repay part of your loan
• Do nothing, but risk rises toward 90% liquidation

At 90% LTV (Liquidation): Automatic and immediate. Only enough collateral is sold to bring your account back to approximately 85% LTV, not your original starting LTV. There is no liquidation fee.