Rubicante is a guardian gargoyle and the Infernal Source’s 4th member of the Malebranche. It is found by entering the Cancer portal on The Harrowing, the middle level of the Infernal Source. Rubicante is one of the thirteen Malebranche that must be freed during the Contract Claws mystery.
To free Rubicante of his contract, you must talk to it and dye him red. He will reward the player with Ramblings of a gargoyle, Sequence 4 and gives the player a hint to be able to enter the Leo portal.
Obtaining all twelve Ramblings of a gargoyle pages is required to complete the Contract Claws mystery.