Araneo [PvP Cross]

Recently reworked, this cave spider went from forgotten clutter to a genuinely useful utility and ambush mount. It's now a proper knockout tame that can be bola'd, climbs walls and ceilings, and fires web shots that apply torpor and build temporary zip lines. Killing a fully webbed target can trigger a web explosion that spreads webbing to nearby enemies, making it great for controlling packs.
It also works as a biological grapple, letting you tether onto weaker creatures to pull them toward you, or get pulled toward larger ones for fast traversal. Not a boss killer, but an excellent pick for cave control, taming support, and getting around vertical terrain fast.