Rooftop Pressure
When the stack reaches the top row the board is full, and the RAISE button locks out until you clear room. Nothing pushes the stack up on its own at the moment, so a full board costs you no HP. It just leaves nowhere to refill into.
In detail
10 HP per second while the board is topped out, meaning a block sits in the top row with nothing resolving. The damage pauses during Ability cinematics. Nothing ends a game on topping out today; the rise simply stalls. This damage is also gated on rise being switched on, and no realm turns rise on, so it does not currently fire at all.
More in glossary
From the current development build. Content and balance may change before release. This public reference includes discoveries and does not reflect your personal unlocks.