Wynncraft Spell Caster+

Holding a hotkey repeats a spell cast, and single presses map simple key bindings to casts. The mod estimates click cooldowns from server-side TPS, so inputs stay accurate at high speed, around 10 clicks per second. The config offers an input delay that can be adjusted, and the author suggests -10 ms, with small changes depending on how consistent the clicks are.

A melee click override stops ordinary attacks from interrupting a spell, and holding melee keeps attacking with a tier-based delay. An info HUD shows the cast click speed for benchmarking. Switching to a different hand slot or weapon disables the override, and the author reports that the melee override causes problems during the Nexus Light raid against the parasite.

The mod requires Fabric API and YetAnotherConfigLib (YACL), and Mod Menu is optional for opening its settings. It runs on the client alone, so players install it and servers need nothing. It is published for Fabric only, for 1.21.11, and is released under the MIT License, which is not an open source license.