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Spoiler Warning: This page contains spoilers which may affect your IVAN experience negatively

Coding: This article contains code which is for experienced users only, and may reveal game secrets

Roundness is an item value used to determine its capacity to block incoming attacks.
In general the higher an item's roundness and size is, the better it is at blocking attacks. If the item is a shield its block modifier is doubled.

long item::GetBlockModifier() const
    return GetSize() * GetRoundness() << 1;
    return GetSize() * GetRoundness() << 2;