Aether-Pulse Gauntlet

A forearm-length bracelet of black alloy with blue arc traces; leaves your hand free.

Charges. 3/day (regains 1d3 at dawn). If you spend 2+ charges in a turn, take 1d4 lightning and the gauntlet shuts down until your next turn.
Grapple Pulse (bonus, 1/SR). Pull yourself 10 ft to a solid point within 20 ft (no OAs).
Aether Bolt (action, 1 charge). Ranged spell attack (use INT or DEX), 60 ft, 2d6 force.
Blink Step (bonus, 1 charge). Teleport 15 ft to a space you can see. The first OA you make this turn has advantage.
Mark & Trace (bonus, 1/SR, 0 charge). Mark a creature for 1 minute; your next hit on it within the duration deals +1d4 lightning, and you ignore half cover for that attack.
Shadow Sync. In dim light/darkness, Blink Step becomes 20 ft.

Notes: Spend a short rest wearing the forearm bracer. Calibration handshake (once per wearer): During the attunement rest make Arcana or Sleight of Hand DC 12. Success: start today with +1 charge (Uncommon) / +1 charge (Rare). Fail: take 1 lightning and no bonus (you still finish attuning). Unattuning: Remove it or go 24 hours without wearing it.