Dêlvewerke Navigator (25 points) is the card's headline and the reason this page is not in the weakest evidence tier.
The enhancement fires in the Reinforcements step of your Movement phase and targets a friendly CTHONIAN BESERKS unit visible to the bearer. The pack's Rules Updates section rewrites its last sentence in full, which is first-party:
Return one destroyed model, excluding CHARACTER models, to that unit, and then, for every 2 Yield Points you just spent, return up to one additional destroyed model, excluding CHARACTER models, to that unit.
That sentence sets the exchange rate for the only model-return effect in the entire faction: one free, then one more per 2 Yield Points. Given that the army rule's stance flips at 7 Yield Points, spending 4 or 6 Yield Points to bring back two or three Beserks is a decision that also decides whether your army is in its aggressive or defensive stance next turn. This card and the army rule are competing for the same pool.
A spelling note. The pack and the Munitorum Field Manual both read Dêlvewerke Navigator. The mirror renders it Dêlvwerke Navigator. We use the two-to-one spelling.
The other three enhancements are mirror-sourced. Quake Supervisor (20 points) gives the bearer Lone Operative while within 3 inches of friendly Leagues of Votann ARTILLERY units and adds 1 to those units' Hit rolls against targets visible to the bearer. Piledriver (15 points) lets the bearer spend up to 2 Yield Points to add that many to the Damage characteristic of its melee weapons for a phase. Multiwave System Jammer (10 points) treats the battle round number as one higher than it is for a Cthonian unit in Reserves, once per battle, which is how a Beserks unit arrives a turn early.
Quake Supervisor is worth pausing on, because it is an artillery buff on a deep striking melee card. Nothing in the detachment rule points at Artillery. That is the clearest sign that this card's enhancement list is broader than its rule, and it is a reason to bring Cthonian Earthshakers even though the detachment rule never mentions them.
Enhancement points are dataslate-volatile and none of the four carries a change marker in this pass.