When increasing the size of a Kabalite Warriors Squad from the Codex: Drukhari, the entry is invalidated when a squad size greater than 8 models (including Sybarite) is selected. The invalidation report reads "Kabalite Warriors: Too many Iridium Suits"
Iridium Suits is not an item from Codex: Drukhari
Squad size for the Kabalite Warriors reads:
This unit contains 1 Sybarite and 4 Kabalite Warriors. It can include up to 5 additional Kabalite Warriors (Power Rating +2), up to 10 additional Kabalite Warriors (Power Rating +4), or up to 15 additional Kabalite Warriors (Power Rating +6). Each model is armed with a splinter rifle.