Learning the Ropes
A telepathic link with the seedlings that are growing inside his body, and the ability to manipulate them as if they were his own limbs. That was what the flavour text of the skill stated, he previously thought it was an active ability that replicated other passive abilities just from the skill description alone, but nothing happened when he chanted the skill name, meaning the ability was actually passive.
He thought back to how the rose wight fought, and how it typically had the tentacles coming from its back, and how the vines could be freely retracted and extended at will. Perhaps it was a morbid way to look at it, but he began envisioning the vine as if it were chains or rope wrapped around a spool, but in this case the spool would have been the rose wight's spine.