The picture below shows the three ships I’ve made with a Tiamarda hull.
As you may have noticed, the one at the bottom is laid out as an armoured cruiser. In my description of this ship, the Oermida, on the product page of my Shapeways shop, I refer to this ship as both an “armoured cruiser” and as a “heavy cruiser.” Normally, these are two different types of ships, and in our own world, they are actually from two different time periods (the first armoured cruiser was launched in 1870, and the last was built in 1911, while the term “heavy cruiser” didn’t appear until 1930). Within the Karadenian navy, however, the two terms are interchangeable. The reason is that, after the launch of the Invictus, seventeen more hulls were allocated for the same class. However, Emperor Plutus Milaius, who ordered this in the first place, changed his mind shortly before the ships were to be launched. He came to the realisation that having eighteen “dreadnought-killers” would likely have invited hostility from countries with substantial navies. Since Karaden was already struggling in an on-and-off war against Taressim, a land-locked country, Emperor Plutus decided that he would be better off with a navy that focused on defense, rather than offense. Thus, twelve of the planned Invictus-class battleships were equipped with smaller guns and thinner armour on both the superstructure and belt. The resulting ships qualified as armoured cruisers, however such ships already existed in the Karadenian navy: they were sailing steamers (like the Selsequenter), but were not built with Tiamarda hulls, and were lighter still. Therefore, the Oermida and her sisters became known as the heavy cruisers, while the existing armoured cruisers became known as medium cruisers.
Around the rest of the continent, the term “heavy cruiser” was not used. The vast majority of cruisers were either armoured cruisers or the lighter protected cruisers. A few of them were large enough to qualify as battlecruisers, though most countries interested in such large vessels simply went the extra mile and built them as dreadnoughts. There is one country where this gets even more confusing: Sondor. Sondor has multiple classes of river warships, which are every bit as powerful as their oceangoing counterparts, but with hulls designed specifically for navigating the prolific waterways of the mainland. These are the river monitors, river cruisers, and river dreadnoughts. Yes, you read that last part correctly. I bring this up because I will likely start work on the Sondorian river fleet next.