Just to add: when Felwinter uses Radiance there is also mention of Shaxx using Sunbreaker. Lore wise all we really have for it’s timing it ‘before the city age’

No ages are specifically given for each of these, but the following are implied to be fairly old: Gunslinger/Golden Gun - first used by Shin Malphur by channeling Solar Light through the Last Word. Striker/Fists of Havoc - first created by Wei Ning after she was rezzed without weapons and found herself pursued by people who wanted her dead; once she realised she couldn't permanently be killed by her attackers, she started using her body as a weapon against them, and right up to her death, she preferred fighting without a weapon, claiming her fists never needed reloading. Thundercrash - created by Efrideet and Saladin when she throws him down a mountain at a Fallen Walker as he charged up a Fists of Havoc. This was not long after Efrideet joined the Iron Lords so we are talking pre-City Age stuff here. Sentinel/Ward of Dawn (or Defender as it was once known) has implied to have been around for a while, long enough for practically all Eliksni to fear Saint-14's use of it against them. Lord Shaxx often used it to protect his people from attacks and the elements back when he was still a Warlord. Cloudstrike's lore implies the existence of a Stormcaller/Stormtrance user in the time of the Warlords. Lord Felwinter used a Well of Radiance to help keep Lord Shaxx's people warm, claiming it was better than a Ward of Dawn in that regard. This was when Shaxx was still a Warlord. The original Arcstrider tab states that Arcstriders have been around since the Dark Ages, but the technique was all but forgotten until it was rediscovered during the Red War.