Seemed the entire Grand Tournament was full of learning. Always a great thing. Have a few more things to keep in mind when facing Tervigons.
Brood Progenitor 5th ed Tyranids Codex pg 52
In addition, all Termagant units within 6" of the Tervigon have the Counter-attack special rule.
Context: During game 2. Some of my Necrons assaulted Termagants and they received the Counter-attack special rule.
Dominion 5th ed Tyranids Codex pg 62
This psychic power is used at the beginning of your turn, before any Instinctive Behaviour tests are rolled. If successful, the Tervigon's synapse range is increased to 18" until the beginning of the next friendly turn.
Context: Asked during my second game about synapse range. Guy told me Tervigon's had 18". Should've questioned further and looked in codex. Would've had to roll for one Tyranid unit.