You need to start with this quest below if you dont see any quest from NPC Maery.
https://bdocodex.com/tw/quest/6500/48/ - The Unseen Ore @ NPC Arteedman. You'll then get to the quest chain that allows you to interact with that tower.
Quests that you'll need to complete in the chain :
The Unseen Ore
Hidden Power
Ganelle and the Blue Stone
Blue Light of the Guard Tower
The tower you'll interact with isnt far from Atanis Pond NPC. Second purple looking tower from the right of the NPC with 3 large rocks close by. Costs 30 energy.